Method and apparatus for reporting channel state information in wireless communication systems

ABSTRACT

A method performed by a terminal in a wireless communication system includes: receiving, from a base station, configuration information associated with a channel state information (CSI) report including at least one information associated with a CSI resource setting; receiving, from the base station, information associated with channel occupancy duration; determining whether at least one symbol for receiving a channel state information reference signal (CSI-RS) is within channel occupancy duration, based on the at least one information associated with the CSI resource setting and the received information associated with the channel occupancy duration; receiving, from the base station, at least one CSI-RS on the at least one symbol, based on a result of the determining; and when the CSI report is determined to be transmitted, transmitting, to the base station, the CSI report based on the configuration information associated with the CSI report and the received at least one CSI-RS.

CROSS-REFERENCE TO RELATED APPLICATION

This application is based on and claims priority under 35 U.S.C. § 119to Korean Patent Application No. 10-2019-0098928 filed on Aug. 13, 2019in the Korean Intellectual Property Office, the disclosure of which isincorporated by reference herein in its entirety.

BACKGROUND 1. Field

The disclosure relates to a wireless communication system, and moreparticularly, to a method and apparatus for reporting channel stateinformation in a wireless communication system.

2. Description of Related Art

In order to satisfy the soaring demand with respect to wireless datatraffic after the commercialization of 4^(th)-generation (4G)communication systems, efforts have been made to develop improved5^(th)-generation (5G) communication systems or pre-5G communicationsystems. For this reason, 5G communication systems or pre-5Gcommunication systems are also referred to as beyond-4G-networkcommunication systems or post-long term evolution (LTE) systems. Forhigher data transmission rates, implementation of 5G communicationsystems in ultra-high frequency bands (millimeter wave (mmWave)), suchas, e.g., 60 giga-Hertz (GHz), is being considered. In 5G communicationsystems, beamforming, massive multi-input multi-output (MIMO), fulldimensional MIMO (FD-MIMO), array antenna, analog beamforming, andlarge-scale antenna technologies have been discussed as ways ofalleviating propagation path loss of radio waves and increasingpropagation distances of radio waves in ultra-high frequency bands. Forsystem network improvement, in 5G communication systems, technologiessuch as evolved small cell, advanced small cell, cloud radio accessnetwork (RAN), ultra-dense network, device to device (D2D)communication, wireless backhaul, moving network, cooperativecommunication, coordinated multi-points (CoMPs), and interferencecancellation have been developed. Also, for 5G systems, othertechnologies have been developed, such as, hybrid frequency-shift keying(FSK) and quadrature amplitude modulation (QAM) modulation (FQAM) andsliding window superposition coding (SWSC), which are advanced codingmodulation (ACM) schemes, and filter bank multi carrier (FBMC),non-orthogonal multiple access (NOMA), and sparse code multiple access(SCMA), which are advanced access schemes.

The Internet, which is a human-oriented connectivity network wherehumans generate and consume information, is now evolving into theInternet of Things (IoT), where distributed entities, such as objects,exchange and process information. The Internet of Everything (IoE) hasalso emerged, which is a combination of IoT technology and Big Dataprocessing technology through connection with a cloud server, etc. Toimplement the IoT, various technological elements, such as sensingtechnology, wired/wireless communication and network infrastructure,service interface technology, and security technology, are required, andrecently technologies related to sensor networks for connecting objects,machine to machine (M2M), machine type communication (MTC), and so forthhave been researched. Such an IoT environment may provide intelligentInternet technology (IT) services that create new value in human life bycollecting and analyzing data generated among connected objects. IoT maybe applied to a variety of fields including smart homes, smartbuildings, smart cities, smart cars or connected cars, smart grids,health care, smart appliances, advanced medical services, and so forththrough convergence and combination between existing IT and variousindustries.

Thus, various attempts have been made to apply 5G communication systemsto IoT networks. For example, 5G communication technology such as asensor network, M2M, MTC, etc., has been implemented by a scheme such asbeamforming, MIMO, array antennas, and so forth. The application of acloud RAN as a Big Data processing technology may also be an example ofthe convergence of 3 eG technology and IoT technology.

As described above, various services may be provided as wirelesscommunication systems develop, and accordingly, ways of smoothlyproviding such services are required. In particular, to provide aservice to a user for a longer time, a communication method for savingpower of a terminal and a method of reporting channel state informationbased on the communication method are required.

SUMMARY

The disclosure provides a communication method for saving power of aterminal and a method and apparatus of reporting channel stateinformation based on the communication method in a wirelesscommunication system.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments of the disclosure.

According to an embodiment of the disclosure, a method performed by aterminal in a wireless communication system includes: receiving, from abase station, configuration information associated with a channel stateinformation (CSI) report including at least one information associatedwith a CSI resource setting; receiving, from the base station,information associated with channel occupancy duration; determiningwhether at least one symbol for receiving a channel state informationreference signal (CSI-RS) is within channel occupancy duration, based onthe at least one information associated with the CSI resource settingand the received information associated with the channel occupancyduration; receiving, from the base station, at least one CSI-RS on theat least one symbol, based on a result of the determining; and when theCSI report is determined to be transmitted, transmitting, to the basestation, the CSI report based on the configuration informationassociated with the CSI report and the received at least one CSI-RS.

When the at least one symbol for receiving the CSI-RS is determined tonot be within the channel occupancy duration, the at least one CSI-RSmay not be received by the terminal on the at least one symbol, and whenthe at least one symbol for receiving the CSI-RS is determined to bewithin the channel occupancy duration, the at least one CSI-RS may bereceived by the terminal based on the at least one symbol.

The method may further include: determining whether an uplink channelfor transmitting the CSI report is within the channel occupancy durationbased on the configuration information associated with the CSI reportand the information associated with channel occupancy duration; and whenthe uplink channel for transmitting the CSI report is within the channeloccupancy duration, determining the CSI report to be transmitted.

The receiving of the at least one CSI-RS on the at least one symbolbased on the result of the determining may include: determining that allof symbols for CSI-RS reception are within the channel occupancyduration; and receiving the CSI-RS in which the all of the symbols forCSI-RS reception is within the channel occupancy duration.

The receiving of the at least one CSI-RS on the at least one symbolbased on the result of the determining may include: determining that atleast one symbol for CSI-RS reception is within the channel occupancyduration; and receiving the CSI-RS in which the at least one symbol forCSI-RS reception is within the channel occupancy duration.

The method may further include determining a CSI processing unit (CPU)occupation time regardless of the channel occupancy duration, whereinthe CSI report may be transmitted based on the determined CPU occupationtime.

The method may further include: identifying channel non-occupancyduration for the CSI report based on the information associated withchannel occupancy duration; determining a most recent CSI-RS before thechannel non-occupancy duration for the CSI-report; and determining a CPUoccupation time based on the most recent CSI-RS before channelnon-occupancy duration for the CSI-report, wherein the CSI report may betransmitted based on the determined CPU occupation time.

The method may further include: identifying channel non-occupancyduration for the CSI report based on the information associated withchannel occupancy duration; and determining a most recent CSI-RS beforethe channel non-occupancy duration for the CSI-report, wherein the CSIreport may be transmitted based on the most recent CSI-RS.

According to an embodiment of the disclosure, a method performed by abase station in a wireless communication system includes: transmitting,to the terminal, configuration information associated with a CSI reportincluding at least one information associated with a CSI resourcesetting; transmitting, to the terminal, information associated withchannel occupancy duration; transmitting, to the terminal, at least oneCSI-RS; and receiving, from the terminal, a CSI report based on theconfiguration information associated with the CSI report, wherein theCSI report is transmitted by the terminal based on some of the at leastone CSI-RS and the at least one information associated with the CSIresource setting, and wherein some of the at least one CSI-RS include atleast one CSI-RS within the channel occupancy duration.

When at least one symbol for transmitting the at least one CSI-RS isdetermined not to be within the channel occupancy duration, the at leastone CSI-RS may not be received by the terminal based on the at least onesymbol, and when the at least one symbol for transmitting the at leastone CSI-RS is determined to be within the channel occupancy duration,the at least one CSI-RS may be received by the terminal based on the atleast one symbol.

According to an embodiment of the disclosure, a terminal in a wirelesscommunication system includes: a transceiver; and at least one processorcoupled with the transceiver and configured to: receive, from a basestation, configuration information associated with a CSI reportincluding at least one information associated with a CSI resourcesetting, receive, from the base station, information associated withchannel occupancy duration, determine whether at least one symbol forreceiving a CSI-RS is within channel occupancy duration, based on the atleast one information associated with the CSI resource setting and thereceived information associated with the channel occupancy duration,receive, from the base station, at least one CSI-RS on the at least onesymbol, based on a result of the determining, and when the CSI report isdetermined to be transmitted, transmit, to the base station, the CSIreport based on the configuration information associated with the CSIreport and the received at least one CSI-RS.

When the at least one symbol for receiving the CSI-RS is determined tonot be within the channel occupancy duration, the at least one CSI-RSmay not be received by the terminal based on the at least one symbol,and when the at least one symbol for receiving the CSI-RS is determinedto be within the channel occupancy duration, the at least one CSI-RS maybe received by the terminal based on the at least one symbol.

The at least one processor may be further configured to: determinewhether an uplink channel for transmitting the CSI report is within thechannel occupancy duration based on the configuration informationassociated with the CSI report and the information associated withchannel occupancy duration, and when the uplink channel for transmittingthe CSI report is within the channel occupancy duration, determine theCSI report to be transmitted.

The at least one processor may be further configured to: determine thatall of symbols for CSI-RS reception is within the channel occupancyduration, and receive the CSI-RS in which all of symbols for CSI-RSreception is within the channel occupancy duration.

The at least one processor may be further configured to: determine thatat least one symbol for CSI-RS reception is within the channel occupancyduration, and receive the CSI-RS in which the at least one symbol forCSI-RS reception is within the channel occupancy duration.

The at least one processor may be further configured to: determine a CSIprocessing unit (CPU) occupation time regardless of the channeloccupancy duration, wherein the CSI report may b transmitted based onthe determined CPU occupation time.

The at least one processor may be further configured to: identifychannel non-occupancy duration for the CSI report based on theinformation associated with channel occupancy duration, determine a mostrecent CSI-RS before the channel non-occupancy duration for theCSI-report, and determine a CPU occupation time based on the most recentCSI-RS before channel non-occupancy duration for the CSI-report, whereinthe CSI report may be transmitted based on the determined CPU occupationtime.

The at least one processor may be further configured to: identifychannel non-occupancy duration for the CSI report based on theinformation associated with channel occupancy duration; and determinethe most recent CSI-RS before the channel non-occupancy duration for theCSI-report, wherein the CSI report may be transmitted based on the mostrecent CSI-RS.

According to an embodiment of the disclosure, a base station in awireless communication system includes: a transceiver; and at least oneprocessor coupled with the transceiver and configured to: transmit, tothe terminal, configuration information associated with a CSI reportincluding at least one information associated with a CSI resourcesetting, transmit, to the terminal, information associated with channeloccupancy duration, transmit, to the terminal, at least one CSI-RS, andreceive, from the terminal, a CSI report based on the configurationinformation associated with the CSI report, wherein the CSI report istransmitted by the terminal based on some of the at least one CSI-RS andthe at least one information associated with the CSI resource setting,and wherein some of the at least one CSI-RS include at least one CSI-RSwithin the channel occupancy duration.

When at least one symbol for transmitting the at least one CSI-RS isdetermined to not be within the channel occupancy duration, the at leastone CSI-RS may not be received by the terminal based on the at least onesymbol, and when the at least one symbol for transmitting the at leastone CSI-RS is determined to be within the channel occupancy duration,the at least one CSI-RS may be received by the terminal based on the atleast one symbol.

Before undertaking the DETAILED DESCRIPTION below, it may beadvantageous to set forth definitions of certain words and phrases usedthroughout this patent document: the terms “include” and “comprise,” aswell as derivatives thereof, mean inclusion without limitation; the term“or,” is inclusive, meaning and/or; the phrases “associated with” and“associated therewith,” as well as derivatives thereof, may mean toinclude, be included within, interconnect with, contain, be containedwithin, connect to or with, couple to or with, be communicable with,cooperate with, interleave, juxtapose, be proximate to, be bound to orwith, have, have a property of, or the like; and the term “controller”means any device, system or part thereof that controls at least oneoperation, such a device may be implemented in hardware, firmware orsoftware, or some combination of at least two of the same. It should benoted that the functionality associated with any particular controllermay be centralized or distributed, whether locally or remotely.

Moreover, various functions described below can be implemented orsupported by one or more computer programs, each of which is formed fromcomputer readable program code and embodied in a computer readablemedium. The terms “application” and “program” refer to one or morecomputer programs, software components, sets of instructions,procedures, functions, objects, classes, instances, related data, or aportion thereof adapted for implementation in a suitable computerreadable program code. The phrase “computer readable program code”includes any type of computer code, including source code, object code,and executable code. The phrase “computer readable medium” includes anytype of medium capable of being accessed by a computer, such as readonly memory (ROM), random access memory (RAM), a hard disk drive, acompact disc (CD), a digital video disc (DVD), or any other type ofmemory. A “non-transitory” computer readable medium excludes wired,wireless, optical, or other communication links that transporttransitory electrical or other signals. A non-transitory computerreadable medium includes media where data can be permanently stored andmedia where data can be stored and later overwritten, such as arewritable optical disc or an erasable memory device.

Definitions for certain words and phrases are provided throughout thispatent document, those of ordinary skill in the art should understandthat in many, if not most instances, such definitions apply to prior, aswell as future uses of such defined words and phrases.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumerals represent like parts:

FIG. 1 illustrates a basic structure of a time-frequency domain that isa resource domain of a wireless communication system, according to anembodiment of the disclosure;

FIG. 2 illustrates a diagram for describing a frame, a sub-frame, and aslot structure of a wireless communication system, according to anembodiment of the disclosure;

FIG. 3 illustrates a diagram for describing an example of a bandwidthpart in a wireless communication system, according to an embodiment ofthe disclosure;

FIG. 4 illustrates a diagram for describing a control region (a controlresource set (CORESET)) of a downlink control channel of a wirelesscommunication system, according to an embodiment of the disclosure;

FIG. 5 illustrates a diagram for describing a structure of a downlinkcontrol channel of a wireless communication system, according to anembodiment of the disclosure;

FIG. 6 illustrates an example of frequency-domain resource allocation ofa physical downlink shared channel (PDSCH) in a wireless communicationsystem, according to an embodiment of the disclosure;

FIG. 7 illustrates an example of time-domain resource allocation of aPDSCH in a wireless communication system, according to an embodiment ofthe disclosure;

FIG. 8 illustrates an example of time-domain resource allocation withrespect to subcarrier spacing of a data channel and a control channel ina wireless communication system, according to an embodiment of thedisclosure;

FIG. 9 illustrates an example of central processing unit (CPU)occupation time for a CSI report in which a report quantity included inthe CSI report is not configured to ‘none’, according to someembodiments of the disclosure;

FIG. 10 illustrates an example of CPU occupation time for a CSI reportin which a report quantity included in the CSI report is configured to‘none’, according to some embodiments of the disclosure;

FIG. 11 illustrates an example in which a listen before talk (LBT)sub-band is divided in a wireless communication system, according tovarious embodiments of the disclosure;

FIG. 12 illustrates an example of valid downlink slot determinationbased on a correlation between a downlink symbol and a flexible symbol,which are configured via a higher layer in a downlink slot, and achannel occupied duration, according to some embodiments of thedisclosure;

FIG. 13 illustrates another example of valid downlink slot determinationaccording to some embodiments of the disclosure;

FIG. 14 illustrates an example of CPU occupation computation accordingto some embodiments of the disclosure;

FIG. 15 illustrates another example of CPU occupation computationaccording to some embodiments of the disclosure;

FIG. 16 illustrates a flowchart of an operation order of a base stationand a terminal, according to some embodiments of the disclosure;

FIG. 17 illustrates a block diagram illustrating a configuration of aterminal according to some embodiments of the disclosure; and

FIG. 18 is a block diagram illustrating a configuration of a basestation according to some embodiments of the disclosure.

DETAILED DESCRIPTION

FIGS. 1 through 18, discussed below, and the various embodiments used todescribe the principles of the present disclosure in this patentdocument are by way of illustration only and should not be construed inany way to limit the scope of the disclosure. Those skilled in the artwill understand that the principles of the present disclosure may beimplemented in any suitably arranged system or device.

Hereinafter, embodiments of the disclosure will be described in detailwith reference to the accompanying drawings.

When the embodiments of the disclosure are described, technical mattersthat are well known in a technical field of the disclosure and are notdirectly related to the disclosure will not be described. By omittingany unnecessary description, the subject matter of the disclosure willbe more clearly described without being obscured.

For the same reason, some elements will be exaggerated, omitted, orsimplified in the attached drawings. The size of each element does notentirely reflect the actual size of the element. In each drawing, anidentical or corresponding element will be referred to as an identicalreference numeral.

Advantages and features of the disclosure and a method for achievingthem will be apparent with reference to embodiments of the disclosuredescribed below together with the attached drawings. However, thedisclosure is not limited to the disclosed embodiments thereof, but maybe implemented in various manners, and the embodiments of the disclosureare provided to complete the disclosure of the disclosure and to allowthose of ordinary skill in the art to understand the scope of thedisclosure, and the disclosure is defined by the category of the claims.Throughout the specification, an identical reference numeral willindicate an identical element.

Throughout the disclosure, the expression “at least one of a, b or c”indicates only a, only b, only c, both a and b, both a and c, both b andc, all of a, b, and c, or variations thereof.

Examples of a terminal may include a user equipment (UE), a mobilestation (MS), a cellular phone, a smartphone, a computer, a multimediasystem capable of performing a communication function, or the like.

In the disclosure, a controller may also be referred to as a processor.

Throughout the specification, a layer (or a layer apparatus) may also bereferred to as an entity.

It will be understood that each block of the flowchart and/or blockdiagram illustrations, and combinations of blocks in the flowchartand/or block diagram illustrations, may be implemented by computerprogram instructions. These computer program instructions may also bestored in a general-purpose computer, a special-purpose computer, or aprocessor of other programmable data processing devices, such that theinstructions implemented by the computer or the processor of theprogrammable data processing device produce a means for performingfunctions specified in the flowchart and/or block diagram block orblocks. These computer program instructions may also be stored in acomputer usable or computer-readable memory that may direct a computeror other programmable data processing apparatus to function in aparticular manner, such that the instructions stored in the computerusable or computer-readable memory produce an article of manufactureincluding instructions that implement the function specified in theflowchart and/or block diagram block or blocks. The computer programinstructions may also be loaded onto a computer or other programmabledata processing apparatus to cause a series of operational steps to beperformed on the computer or other programmable apparatus to produce acomputer implemented process, such that the instructions that executethe computer or other programmable apparatus may provide steps forimplementing the functions specified in the flowchart and/or blockdiagram block or blocks.

In addition, each block represents a module, segment, or portion ofcode, which includes one or more executable instructions forimplementing the specified logical function(s). It should also be notedthat in other implementations, the function(s) noted in the blocks mayoccur out of the order indicated. For example, two blocks shown insuccession may, in fact, be executed substantially concurrently or theblocks may sometimes be executed in the reverse order, depending on thefunctionality involved.

The term ‘˜unit’ used herein refers to software or a hardware elementsuch as a field-programmable gate array (FPGA), an application specificintegrated circuit (ASIC), etc., and ‘˜unit’ plays specific roles.However, the meaning of ‘˜unit’ is not limited to software or hardware.‘˜unit’ may advantageously be configured to reside on the addressablestorage medium and configured to reproduce one or more processors. Thus,according to some embodiments of the disclosure, a unit may include, byway of example, components, such as software components, object-orientedsoftware components, class components and task components, processes,functions, attributes, procedures, subroutines, segments of programcode, drivers, firmware, microcode, circuitry, data, databases, datastructures, tables, arrays, and variables. The functionality providedfor in the components and ‘˜unit(s)’ may be combined into fewercomponents and ‘˜unit(s)’ or further separated into additionalcomponents and ‘˜unit(s)’. In addition, components and ‘˜unit(s)’ may beimplemented to execute one or more CPUs in a device or a securemultimedia card. In some embodiments of the disclosure, ‘˜unit’ mayinclude one or more processors.

Hereinafter, the operating principles of the disclosure will bedescribed with reference to the accompanying drawings. In the followingdescription of the disclosure, a detailed description of well-knownfunctions or elements associated with the disclosure will be omitted ifit unnecessarily obscures the subject matter of the disclosure. Theterms as used herein are defined considering the functions in thedisclosure and may be replaced with other terms according to theintention or practice of the user or operator. Therefore, the termsshould be defined based on the overall disclosure. Hereinbelow, the basestation is an entity that performs resource assignment of the terminal,and may be at least one of gNode B, an evolved Node B (eNode B), Node B,a base station (BS), a wireless access unit, a base station controller,or a node on a network. The terminal may include a UE, an MS, a cellularphone, a smartphone, a computer, or a multimedia system capable ofperforming communication functions. Needless to say, the disclosure isnot limited to the example. Hereinbelow, the disclosure will describe atechnique for receiving, by a terminal, broadcast information from abase station in a wireless communication system. The disclosure relatesto a communication technique, which is a convergence of the Internet ofThings (IoT) technology and 5^(th)-generation (5G) communication systemfor supporting higher data transmission rate beyond 4^(th)-generation(4G) system, and a system for same. The disclosure may be applied tosmart services (e.g. smart homes, smart buildings, smart cities, smartcars or connected cars, health care, digital education, retailbusinesses, security- and safety-related services and the like) on thebasis of 5G communication technology and IoT-related technology.

As used below, a term indicating broadcasting information, a termindicating control information, a term related to a communicationcoverage, a term indicating a state change (e.g., an event), a termindicating network entities, a term indicating messages, a termindicating a component of an apparatus, etc., will be presented forconvenience of a description. Therefore, the disclosure is not limitedby the following terms, and other terms having equivalent technicalmeanings may be used.

Hereinbelow, for convenience of a description, the disclosure may employterms and names defined in the 3^(rd)-Generation Partnership ProjectLong Term Evolution (3GPP LTE) standards. However, the disclosure is notlimited by such terms and names, and may be equally applied to systemscomplying with other standards.

A wireless communication system has evolved from an initial one thatprovides a voice-oriented service to a broadband wireless communicationsystem that provides a high-speed and high-quality packet data service,like the communication standards, such as 3GPP high speed packet access(HSPA), LTE or Evolved Universal Terrestrial Radio Access (E-UTRA),LTE-Advanced (LTE-A), LTE-Pro, 3GPP2 high rate packet data (HRPD), UltraMobile Broadband (UMB), the Institute of Electrical and ElectronicsEngineers (IEEE) 802.16e, etc.

In an LTE system as a representative example of a broadband wirelesscommunication system, orthogonal frequency division multiplexing (OFDM)is employed in a DL and single carrier frequency division multipleaccess (SC-FDMA) is employed in an UL. The UL means a radio link throughwhich a UE transmits data or a control signal to a base station (eNodeBor BS), and the DL means a radio link through which the base stationtransmits data or a control signal to the UE. The above-describedmultiple access scheme separates data or control information for eachuser by allocating and operating time-frequency resources on which thedata or the control information is carried for each user, so that thetime-frequency resources do not overlap with each other, that is, sothat orthogonality is realized.

A 5G communication system, that is, a post-LTE communication system,needs to freely reflect various requirements from a user and a serviceprovider, such that a service satisfying the various requirements has tobe supported. Services taken into consideration for the 5G communicationsystem may include enhanced mobile broadband (eMBB) communication,massive machine type communication (mMTC), ultra reliability low latencycommunication (URLLC), etc.

According to some embodiments of the disclosure, the eMBB may aim toprovide a further enhanced data transmission speed than a datatransmission speed supported by existing LTE, LTE-A, or LTE-Pro. Forexample, in the 5G communication system, with respect to one BS, theeMBB needs to provide a peak data rate of 20 Gbps in the DL and a peakdata rate of 10 Gbps in the UL. Furthermore, the 5G or NR communicationsystem should be able to provide an increased user-perceived data rate.In order to satisfy such a requirement, transmission and receptiontechnologies including a further enhanced MIMO transmission technologyneed to be improved. Moreover, by using a frequency bandwidth wider than20 MHz in a frequency band of 3 to 6 GHz or more instead of a band of 2GHz used in the current LTE, the data rates required for the 5Gcommunication system may be satisfied.

At the same time, in the 5G communication system, mMTC is taken intoconsideration in order to support application services, such as IoT.Access by many UEs within a single cell, coverage improvement of a UE,an increased battery time, a reduction in the cost of a UE are requiredin order for mMTC to efficiently provide for the IoT. The IoT isattached to various sensors and various devices to provide acommunication function, and thus should be able to support many UEs(e.g., 1,000,000 UEs/km²) within a cell. Furthermore, a UE supportingmMTC requires wider coverage compared to other services provided by the5G communication system because there is a high possibility that the UEmay be located in a shadow area not covered by a cell, such as theunderground of a building. A terminal supporting mMTC needs to be acheap UE, and requires a very long battery lifetime due to thedifficulty of frequently replacing the battery of the UE.

Last, URLLC is a mission-critical cellular-based wireless communicationservice, and may needs to provide communication having a super-lowlatency and an ultra reliability as a service used for remote control ofrobots or machinery, industrial automation, unmanned aerial vehicles,remote health care, emergency alert, etc. For example, servicessupporting URLLC may require air interface latency to be less than 0.5millisecond and also a packet error rate of 10⁻⁵ or less. Accordingly,for services supporting URLLC, the 5G communication system needs toprovide a transmission time interval (TTI) less than that of otherservices, and also requires the design for allocating resources in awide frequency band. However, the above-described mMTC, URLLC, and eMBBare merely examples of different service types, and a service type towhich the disclosure is applied is not limited to the foregoingexamples.

The services considered in the above-described 5G communication systemneed to be provided by being integrated based on one framework. That is,for efficient resource management and control, the services may becontrolled and transmitted by being integrated into one system, ratherthan being managed independently.

While embodiments of the disclosure are described by using an LTE,LTE-A, LTE-Pro, or NR system as an example, the embodiments of thedisclosure may also be applied to other communication systems having asimilar technical background or channel form. Also, the embodiments ofthe disclosure may also be applied to other communication systemsthrough some modifications within a range that does not largely departfrom the scope of the disclosure based on determination of a skilledperson.

The disclosure relates to a random access method and apparatus for aplurality of devices in a wireless communication system.

According to the disclosure, when a terminal operates in a power savingmode in a wireless communication system, a method of reporting channelstate information may be optimized for the situation, thereby furtherenhancing a power saving effect.

Hereinafter, a frame structure of a 5G system will be described in moredetail with reference to the drawings.

FIG. 1 illustrates a basic structure of a time-frequency domain that isa resource domain of a wireless communication system, according to anembodiment of the disclosure.

Referring to FIG. 1, a horizontal axis represents a time domain, and avertical axis represents a frequency domain. In the time and frequencydomains, a basic unit of a resource is a resource element (RE) 1-01which may be defined as one orthogonal frequency division multiplexing(OFDM) symbol 1-02 along a time axis and one subcarrier 1-03 along afrequency axis. In the frequency domain, N_(SC) ^(RB) (e.g., 12)consecutive REs may constitute one resource block (RB) 1-04. In anembodiment of the disclosure, a plurality of OFDM symbols may constituteone subframe 1-10.

FIG. 2 illustrates a diagram for describing a frame, a sub-frame, and aslot structure of a wireless communication system, according to anembodiment of the disclosure.

Referring to FIG. 2, one frame 2-00 may include one or more subframes2-01, each of which may include one or more slots 2-02. For example, oneframe 2-00 may be defined as 10 milliseconds (ms). One subframe 2-01 maybe defined as 1 ms, such that one frame 2-00 may include a total of tensubframes 2-01. One slot 2-02 or 2-03 may be defined as fourteen OFDMsymbols (i.e., the number of slots per slot (N_(symb) ^(slot))=14). Onesubframe 2-01 may include one slot or a plurality of slots 2-02 and2-03, and the number of slots 2-02 and 2-03 per subframe 2-01 may varywith set values μ 2-04 and 2-05 for subcarrier spacing. An example ofFIG. 2 shows μ=02-04 and μ=12-05 as the set values for the subcarrierspacing. For μ=02-04, one subframe 2-01 may include one slot 2-02, andfor μ=12-05, one subframe 2-01 may include two slots 2-03. That is, thenumber of slots per subframe, N_(slot) ^(subframe,μ), may differ withthe set value μ for the subcarrier interval, and the number of slots perframe, N_(slot) ^(frame,μ), may vary with the number of slots persubframe. N_(slot) ^(subframe,μ) and N_(slot) ^(frame,μ) based on theset value μ for the subcarrier spacing may be defined as shown in [Table1].

TABLE 1 μ N_(symb) ^(slot) N_(slot) ^(frame, μ) N_(slot) ^(subframe, μ)0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16 5 14 320 32

In NR, one component carrier (CC) or serving cell may include a maximumof 250 RBs or more. Thus, when the terminal receives a serving cellbandwidth at all times like in LTE, much power consumption of theterminal may be accompanied, and to solve this problem, the base stationmay configure one or more bandwidth parts (BWPs) for the terminal tosupport the terminal to change a reception region in a cell. In NR, thebase station may configure an ‘initial BWP’, which is a bandwidth of acontrol region CORESET #0 (or a common search space (CSS)), for theterminal through an MIB. Thereafter, the base station may configure afirst BWP of the terminal through RRC signaling, and notify at least oneBWP configuration information that may be indicated by downlink controlinformation (DCI) in the future. Thereafter, the base station mayindicate a band to be used by the terminal, by noticing a BWP ID throughthe DCI. When the terminal fails to receive DCI in a currently allocatedBWP for a certain time or longer, the terminal may return to ‘defaultBWP’ and attempt to receive DCI.

FIG. 3 illustrates a diagram for describing an example of a bandwidthpart in a wireless communication system, according to an embodiment ofthe disclosure.

Referring to FIG. 3, a UE bandwidth 3-00 may include two BWPs, i.e., BWP#1 3-05 and BWP #2 3-10. The base station may configure one BWP ormultiple BWPs for the terminal, and configure information as shown in[Table 2] for each BWP.

TABLE 2 BWP ::= SEQUENCE { bwp-Id BWP-Id, locationAndBandwidth INTEGER(1..65536), subcarrierSpacing ENUMERATED {n0, n1, n2, n3, n4, n5},cyclicPrefix ENUMERATED { extended } }

However, the disclosure is not limited to the above-described example,and various parameters related to a BWP may be configured to theterminal. The foregoing information may be transmitted from the basestation to the terminal through higher layer signaling, e.g., RRCsignaling. Among the configured one or multiple BWPs, at least one BWPmay be activated. Whether to activate the configured BWP may betransmitted from the base station to the terminal in a semi-staticmanner through RRC signaling or dynamically through a medium accesscontrol (MAC) control element (CE) or DCI.

According to an embodiment of the disclosure, before radio resourcecontrol (RRC) connection, a terminal may be configured with an initialBWP for initial connection from the base station through a masterinformation block (MIB). More specifically, the terminal may receive acontrol region (Control Resource Set, CORESET) in which a PDCCH may betransmitted, and configuration information about a search space in orderto receive system information (remaining system information (RMSI) or asystem information block 1 (SIB1)) required for initial connectionthrough an MIB in the initial connection stage. The control region andthe search space that are configured through the MIB may be regarded asan identity (ID) 0, respectively.

The base station may notify the terminal of configuration informationsuch as frequency allocation information, time allocation information, anumerology, etc., for CORESET #0 through the MIB. The base station maynotify the terminal of configuration information about a monitoringperiod for CORESET #0 and configuration information for an occasion,i.e., configuration information for search space #0, through the MIB.The terminal may regard a frequency domain configured as CORESET #0obtained from the MIB as an initial BWP for initial connection. In thiscase, the ID of the initial BWP may be regarded as 0.

Configuration of a BWP supported in the above-described wirelesscommunication system (5G or NR system) may be used for various purposes.

For example, when a bandwidth supported by the terminal is smaller thana system bandwidth, a bandwidth supported by the terminal may besupported through configuration of a BWP. For example, in [Table 2], asa frequency position (configuration information 2) of a BWP isconfigured for the terminal, the terminal may transmit and receive dataat a certain frequency position in a system bandwidth.

In another example, to support different numerologies, the base stationmay configure multiple BWPs for the terminal. For example, to supportdata transmission and reception using both a subcarrier spacing of 15kilo-Hertz (KHz) and a subcarrier spacing of 30 KHz for a terminal, twoBWPs may be configured to use subcarrier spacings of 15 KHz and 30 KHz,respectively. Different BWPs may be subject to frequency divisionmultiplexing (FDM), and a BWP configured by a corresponding tosubcarrier spacing may be activated to transmit and receive data withthe subcarrier spacing.

In another example, to reduce power consumption of the terminal, thebase station may configure BWPs having different bandwidths for theterminal. For example, when the terminal supports a large bandwidth,e.g., a bandwidth of 100 MHz, and transmits and receives data with thebandwidth at all times, much power consumption may be caused. Inparticular, in the absence of traffic, it may be more inefficient interms of power consumption for the terminal to perform monitoring withrespect to an unnecessary downlink control channel for the largebandwidth of 100 mega-Hertz (MHz). Thus, to reduce power consumption ofthe terminal, the base station may configure a BWP of a small bandwidth,e.g., a BWP of 20 MHz for the terminal. In the absence of traffic, theterminal may perform monitoring in the BWP of 20 MHz, and upongeneration of data, the terminal may transmit and receive data by usingthe BWP of 100 MHz according to an indication of the base station.

In the above-described method of configuring a BWP, terminals before RRCconnection may receive configuration information regarding an initialBWP through an MIB in the initial connection stage. More specifically,the terminal may be configured with a control region (CORESET) for adownlink control channel in which DCI for scheduling a systeminformation block (SIB) is transmitted through an MIB of a physicalbroadcast channel (PBCH). The bandwidth of the control region configuredthrough the MIB may be regarded as an initial BWP, and the terminal mayreceive a PDSCH in which a SIB is transmitted through the configuredinitial BWP. The initial BWP may be used for other system information(OSI), paging, and random access as well as for reception of the SIB.

Hereinbelow, a synchronization signal (SS)/PBCH block of a wirelesscommunication system (5G or NR system) according to an embodiment of thedisclosure will be described.

An SS/PBCH block may mean a physical layer channel block including aprimary SS (PSS), a secondary SS (SSS), and a PBCH. More specifically,the SS/PBCH block may be defined as below.

-   -   PSS: provides partial information of a cell ID as a signal that        is a criterion for downlink time/frequency synchronization.    -   SSS: is a criterion for downlink time/frequency synchronization        and provides the other cell ID information that is not provided        by the PSS. Additionally, the SSS serves as a reference signal        for demodulation of a PBCH.    -   PBCH: provides essential system information required for        transmission/reception of a data channel and a control channel        of a terminal. The essential system information may include        search space-related control information indicating radio        resource mapping information of a control channel, scheduling        control information for a separate data channel that transmits        system information.    -   SS/PBCH block: the SS/PBCH block may include a combination of a        PSS, an SSS, and a PBCH. One SS/PBCH block or a plurality of        SS/PBCH blocks may be transmitted during 5 ms, and each        transmitted SS/PBCH block may be identified by an index.

The terminal may detect the PSS and the SSS and decode the PBCH in theinitial connection stage. The terminal may obtain the MIB from the PBCH,and may be configured with CORESET #0 through the MIB. The terminal mayperform monitoring with respect to CORESET #0, assuming that theselected SS/PBCH block and a demodulation reference signal (DMRS)transmitted in CORESET #0 are quasi-co-located (QCL). The terminal mayreceive system information through downlink control informationtransmitted in CORESET #0. The terminal may obtain random access channel(RACH)-related configuration information required for initial connectionfrom the received system information. The terminal may transmit aphysical RACH (PRACH) to the base station based on the selected SS/PBCHindex, and the base station having received the PRACH may obtaininformation about the SS/PBCH block index selected by the terminal. Thebase station may recognize which block among the SS/PBCH blocks theterminal has selected and that the terminal monitors CORESET #0corresponding (or related) to the SS/PBCH block selected by theterminal.

Hereinbelow, DCI in a wireless communication system (e.g., a 5G or NRsystem) will be described in more detail.

In the wireless communication system (e.g., the 5G or NR system),scheduling information for uplink data (or a physical uplink sharedchannel (PUSCH)) or downlink data (or a physical downlink shared channel(PDSCH)) may be transmitted from the base station to the terminalthrough the DCI. The terminal may monitor a DCI format for fallback anda DCI format for non-fallback for a PUSCH or a PDSCH. The fallback DCIformat may include a fixed field predefined between the base station andthe terminal, and the non-fallback DCI format may include a field thatmay be configured.

The DCI may be transmitted through a physical downlink control channel(PDCCH) through channel coding and modulation. A cyclic redundancy check(CRC) may be added to a DCI message payload, and the CRC may bescrambled by a radio network temporary identifier (RNTI) correspondingto an identity of the terminal. Depending on the purpose of the DCImessage, e.g., UE-specific data transmission, power control command,random access response, etc., different RNTIs may be used to scramble aCRC added to a payload of the DCI message. That is, the RNTI may betransmitted by being included in CRC calculation, instead of beingexplicitly transmitted. Upon reception of the DCI message transmitted ona PDCCH, the terminal may identify the CRC by using the allocated RNTI.When the CRC identification result is right, the terminal may recognizethat the message is transmitted to the terminal.

For example, the DCI for scheduling the PDSCH for system information(SI) may be scrambled by an SI-RNTI. The DCI for scheduling the PDSCHfor a random access response (RAR) message may be scrambled by anRA-RNTI. The DCI for scheduling the PDSCH for a paging message may bescrambled by a P-RNTI. The DCI for notifying a slot format indicator(SFI) may be scrambled by an SFI-RNTI. The DCI for notifying transmitpower control (TPC) may be scrambled by a TPC-RNTI. The DCI forscheduling a terminal-specific PDSCH or PUSCH may be scrambled by a cell(C)-RNTI.

DCI format 0_0 may be used as a fallback DCI for scheduling the PUSCH,and in this case, the CRC may be scrambled by the C-RNTI. In anembodiment of the disclosure, DCI format 0_0 in which the CRC isscrambled by the C-RNTI may include information as shown in [Table 3].

TABLE 3 Identifier for DCI formats - [1] bit Frequency domain resourceassignment -[┌log₂ (N_(RB) ^(UL, BWP) (N_(RB) ^(UL, BWP) + 1)/2)┐] bitsTime domain resource assignment - X bits Frequency hopping flag - 1 bit.Modulation and coding scheme - 5 bits New data indicator - 1 bitRedundancy version - 2 bits HARQ process number - 4 bits TPC command forscheduled PUSCH - [2] bits UL/SUL indicator - 0 or 1 bit

DCI format 0_1 may be used as a non-fallback DCI for scheduling thePUSCH, and in this case, the CRC may be scrambled by the C-RNTI. In anembodiment of the disclosure, DCI format 0_1 in which the CRC isscrambled by the C-RNTI may include information as shown in [Table 4].

TABLE 4 Carrier indicator-0 or 3 bits UL/SUL indicator-0 or 1 bitIdentifier for DCI formats-[1] bits Bandwidth part indicator-0, 1 or 2bits Frequency domain resource assignment  For resource allocation type0, ┌N_(RB) ^(UL,BWP)/P┐ bits  For resource allocation type 1,  ┌log₂(N_(RB) ^(UL,BWP)(N_(RB) ^(UL,BWP) + 1)/2)┐ bits Time domain resourceassignment-1, 2, 3, or 4 bits VRB-to-PRB mapping-0 or 1 bit, only forresource allocation type 1.  0 bit if only resource allocation type 0 isconfigured;  1 bit otherwise. Frequency hopping flag-0 or 1 bit, onlyfor resource allocation type 1.  0 bit if only resource allocation type0 is configured;  1 bit otherwise. Modulation and coding scheme-5 bitsNew data indicator-1 bit Redundancy version-2 bits HARQ process number-4bits 1st downlink assignment index-1 or 2 bits  1 bit for semi-staticHARQ-ACK codebook;  2 bits for dynamic HARQ-ACK codebook with  singleHARQ-ACK codebook. 2nd downlink assignment index-0 or 2 bits  2 bits fordynamic HARQ-ACK codebook with  two HARQ-ACK sub-codebooks;  0 bitotherwise. TPC command for scheduled PUSCH-2 bits${{SRS}\mspace{14mu} {resource}\mspace{14mu} {indicator}} - {\left\lceil {\log_{2}\left( {\sum\limits_{k = 1}^{L_{\max}}\; \begin{pmatrix}N_{SRS} \\k\end{pmatrix}} \right)} \right\rceil \mspace{14mu} {or}\mspace{14mu} \left\lceil {\log_{2}\left( N_{SRS} \right)} \right\rceil \mspace{14mu} {bits}}$ $\left\lceil {\log_{2}\left( {\sum\limits_{k = 1}^{L_{\max}}\; \begin{pmatrix}N_{SRS} \\k\end{pmatrix}} \right)} \right\rceil \text{bits for non-codebook based PUSCH transmission;}$ ┌log₂(N_(SRS))┐ bits for codebook based PUSCH transmission. Precodinginformation and number of layers-up to 6 bits Antenna ports-up to 5 bitsSRS request-2 bits CSI request-0, 1, 2, 3, 4, 5, or 6 bits CBGtransmission information-0, 2, 4, 6, or 8 bits PTRS-DMRS association-0or 2 bits. beta_offset indicator-0 or 2 bits DMRS sequenceinitialization-0 or 1 bit

DCI format 1_0 may be used as a fallback DCI for scheduling the PDSCH,and in this case, the CRC may be scrambled by the C-RNTI. In anembodiment of the disclosure, DCI format 1_0 in which the CRC isscrambled by the C-RNTI may include information as shown in [Table 5].

TABLE 5 Identifier for DCI formats - [1] bit Frequency domain resourceassignment -[┌log₂ (N_(RB) ^(DL, BWP) (N_(RB) ^(DL, BWP) + 1)/2)┐] bitsTime domain resource assignment - X bits VRB-to-PRB mapping - 1 bit.Modulation and coding scheme - 5 bits New data indicator - 1 bitRedundancy version - 2 bits HARQ process number - 4 bits Downlinkassignment index - 2 bits TPC command for scheduled PUCCH - [2] bitsPUCCH resource indicator - 3 bits PDSCH-to-HARQ feedback timingindicator - [3] bits

DCI format 1_1 may be used as a non-fallback DCI for scheduling thePUSCH, and in this case, the CRC may be scrambled by the C-RNTI. In anembodiment of the disclosure, DCI format 1_1 in which the CRC isscrambled by the C-RNTI may include information as shown in [Table 6].

TABLE 6 Carrier indicator - 0 or 3 bits Identifier for DCI formats - [1]bits Bandwidth part indicator - 0, 1 or 2 bits Frequency domain resourceassignment For resource allocation type 0, ┌N_(RB) ^(DL, BWP)/P┐ bitsFor resource allocation type 1, ┌log₂ (N_(RB) ^(DL, BWP) (N_(RB)^(DL, BWP) + 1)/2)┐ bits Time domain resource assignment -1, 2, 3, or 4bits VRB-to-PRB mapping - 0 or 1 bit, only for resource allocationtype 1. 0 bit if only resource allocation type 0 is configured; 1 bitotherwise. PRB bundling size indicator - 0 or 1 bit Rate matchingindicator - 0, 1, or 2 bits ZP CSI-RS trigger - 0, 1, or 2 bits Fortransport block 1: Modulation and coding scheme - 5 bits New dataindicator - 1 bit Redundancy version - 2 bits For transport block 2:Modulation and coding scheme - 5 bits New data indicator - 1 bitRedundancy version - 2 bits HARQ process number - 4 bits Downlinkassignment index - 0 or 2 or 4 bits TPC command for scheduled PUCCH - 2bits PUCCH resource indicator - 3 bits PDSCH-to-HARQ_feedback timingindicator - 3 bits Antenna ports - 4, 5 or 6 bits Transmissionconfiguration indication - 0 or 3 bits SRS request - 2 bits CBGtransmission information - 0, 2, 4, 6, or 8 bits CBG flushing outinformation - 0 or 1 bit DMRS sequence initialization - 1 bit

FIG. 4 illustrates a diagram for describing a control region (a controlresource set (CORESET)) of a downlink control channel of a wirelesscommunication system, according to an embodiment of the disclosure.

Referring to FIG. 4, it may be seen that two control regions (CORESET #14-01 and CORESET #2 4-02) are configured in a terminal bandwidth part4-10 in a frequency axis and one slot 4-20 in a time axis. The controlregions 4-01 and 4-02 may be configured in a particular resource 4-03 inthe entire terminal bandwidth part 4-10 in the frequency axis. In thetime axis, the control regions 4-01 and 4-02 may be configured with oneOFDM symbol or a plurality of OFDM symbols, which may be defined as aCORESET duration 4-04. Referring to FIG. 4, CORESET #1 4-01 may beconfigured with a CORESET duration of 2 symbols, and CORESET #2 4-02 maybe configured with a CORESET duration of 1 symbol.

The control region in the wireless communication system (e.g., the 5G orNR system) may be configured by the BS for the terminal through higherlayer signaling (e.g., system information, an MIB, RRC signaling, etc.).Configuring the control region for the terminal may mean providinginformation such as an ID of a control region, a frequency position ofthe control region, a symbol length of the control region, etc. Forexample, configuration of the control region may include information asprovided in [Table 7].

TABLE 7 ControlResourceSet ::= SEQUENCE { -- Corresponds to L1 parameter‘CORESET-ID’ controlResourceSetId ControlResourceSetId,frequencyDomainResources BIT STRING (SIZE (45)), duration INTEGER(1..maxCoReSetDuration), cce-REG-MappingType CHOICE { interleavedSEQUENCE { reg-BundleSize ENUMERATED {n2, n3, n6}, precoderGranularityENUMERATED {sameAsREG-bundle, allContiguousRBs}, interleaverSizeENUMERATED {n2, n3, n6} shiftIndexINTEGER(0..maxNrofPhysicalResourceBlocks-1) OPTIONAL }, nonInterleavedNULL }, tci-StatesPDCCH SEQUENCE(SIZE (1..maxNrofTCI- StatesPDCCH)) OFTCI-StateId OPTIONAL, tci-PresentInDCI ENUMERATED {enabled} OPTIONAL, --Need S }

In [Table 7], tci-StatesPDCCH (hereinafter, referred to as ‘TCI state’)configuration information may include information of one or more SS/PBCHblock indexes having a QCL relationship with a DMRS transmitted in thecorresponding control region or CSI-RS index.

FIG. 5 illustrates a diagram for describing a structure of a downlinkcontrol channel of a wireless communication system, according to anembodiment of the disclosure.

FIG. 5 shows an example of a basic unit of time and frequency resourcesthat forms a downlink control channel that may be used in 5G system,according to an embodiment of the disclosure.

Referring to FIG. 5, the basic unit of the time and frequency resourcesthat forms the control channel may be defined as a resource elementgroup (REG) 5-03. The REG 5-03 may be defined as 12 subcarriersincluding one OFDM symbol 5-01 in the time axis and one physicalresource block (PRB) 5-02 in the frequency axis. The base station mayconfigure a downlink control channel allocation unit by concatenatingthe REG 5-03.

As shown in FIG. 5, when it is assumed that the basic unit to which thedownlink control channel is allocated is a control channel element (CCE)5-04 in 5G system, one CCE 5-04 may include a plurality of REGs 5-03.For example, the REG 5-03 shown in FIG. 5 may include 12 REs, and whenone CCE 5-04 includes six REGs 5-03, one CCE 5-04 may include 72 REs.When a downlink control region (control resource set) is configured, thedownlink control region may include a plurality of CCEs 5-04 and acertain downlink control channel may be transmitted by being mapped toone or more CCEs 504 according to an aggregation level (AL) in thecontrol region. The CCEs 5-04 in the control region (control resourceset) may be identified by numbers in which the numbers of the CCEs 5-04may be given based on a logical mapping scheme.

The basic unit of the downlink control channel shown in FIG. 5, i.e.,the REG 5-03 may include both REs to which DCI is mapped and a region towhich a DMRS 5-05, which is a reference signal for decoding the REs, ismapped. As shown in FIG. 5, three DMRSs 5-05 may be transmitted in oneREG 5-03. The number of CCEs required for transmission of a PDCCH may be1, 2, 4, 8, and 16 depending on an AL, and different numbers of CCEs maybe used to implement link adaptation of a downlink control channel. Forexample, when AL=L, one downlink control channel may be transmittedthrough L CCEs.

The terminal needs to detect a signal in a state of being unaware ofinformation about the downlink control channel, and a search spaceindicating a set of CCEs for blind decoding may be defined. The searchspace may be a set of downlink control channel candidates including CCEsfor which the terminal has to attempt decoding at a given AL. As theremay be several ALs forming one group with 1, 2, 4, 8, or 16 CCEs, theterminal may have a plurality of search spaces. A search space set maybe defined as a set of search spaces at all the configured ALs.

The search space may be classified into a common search space and aterminal-specific (UE-specific) search space. According to an embodimentof the disclosure, terminals in a particular group or all the terminalsmay investigate the common search space of the PDCCH in order to receivecell-common control information such as dynamic scheduling for thesystem information or paging message.

For example, the terminal may investigate the common search space of thePDCCH to receive PDSCH scheduling allocation information fortransmission of a SIB including operator information of a cell, etc. Forthe common search space, terminals in a certain group or all terminalshave to receive a PDCCH, such that the common search space may bedefined as a set of pre-agreed CCEs. Meanwhile, the terminal may receivescheduling allocation information for the terminal-specific PDSCH orPUSCH by investigating the terminal-specific search space of the PDCCH.The terminal-specific search space may be defined terminal-specificallyas a function of the identity of the terminal and various systemparameters.

In 5G system, a parameter for a search space for a PDCCH may be set forthe terminal by the base station through higher layer signaling (e.g.,SIB, MIB, or RRC signaling). For example, the base station may configurefor the terminal, the number of PDCCH candidates at each AL L, amonitoring period for the search space, a monitoring occasion in theunit of a symbol in a slot for the search space, a search space type(common search space or terminal-specific search space), a combinationof a DCI format to be monitored in the search space and an RNTI, acontrol region (control resource set) index for monitoring the searchspace, etc. For example, the foregoing configuration may includeinformation as provided in [Table 8].

TABLE 8 SearchSpace ::= SEQUENCE { -- Identity of the search space.SearchSpaceId = 0 identifies the SearchSpace configured via PBCH (MIB)or ServingCellConfigCommon. searchSpaceId SearchSpaceId,controlResourceSetId ControlResourceSetId,monitoringSlotPeriodicityAndOffset CHOICE { sl1 NULL, sl2 INTEGER(0..1), sl4 INTEGER (0..3), sl5 INTEGER (0..4), sl8 INTEGER (0..7), sl10INTEGER (0..9), sl16 INTEGER (0..15), sl20 INTEGER (0..19) } OPTIONAL, duration  INTEGER (2..2559) monitoringSymbolsWithinSlot BIT STRING(SIZE (14)) OPTIONAL, nrofCandidates SEQUENCE { aggregationLevel1ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel2ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel4ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel8ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel16ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8} }, searchSpaceType CHOICE {-- Configures this search space as common search space (CSS) and DCIformats to monitor. common SEQUENCE {  } ue-Specific SEQUENCE { --Indicates whether the UE monitors in this USS for DCI formats 0-0 and1-0 or for formats 0-1 and 1-1. formats ENUMERATED {formats0-0-And-1-0,formats0-1-And-1-1}, ... }

Based on the configuration information, the base station may configurethe terminal with one or more search space set. According to anembodiment of the disclosure, the base station may configure theterminal with a search space set 1 and a search space set 2, configurethe terminal to monitor a DCI format A scrambled by X-RNTI in the searchspace set 1 in the common search space, and/or configure the terminal tomonitor a DCI format B scrambled by Y-RNTI in the search space set 2 inthe terminal-specific search space.

According to the configuration information, one or more search spacesets may exist in the common search space or the terminal-specificsearch space. For example, a search space set #1 and a search space set#2 may be configured as common search spaces, and a search space set #3and a search space set #4 may be configured as terminal-specific searchspaces.

In the common search space, the following combination of the DCI formatand the RNTI may be monitored. Needless to say, the disclosure is notlimited to the following example.

-   -   DCI format 0_0/1_0 with CRC scrambled by C-RNTI, CS-RNTI,        SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI    -   DCI format 2_0 with CRC scrambled by SFI-RNTI    -   DCI format 2_1 with CRC scrambled by INT-RNTI    -   DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI,        TPC-PUCCH-RNTI    -   DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

In the terminal-specific search space, a combination of the DCI formatand the RNTI may be monitored. Needless to say, the disclosure is notlimited to the following example.

-   -   DCI format 0_0/1_0 with CRC scrambled by C-RNTI, CS-RNTI,        TC-RNTI    -   DCI format 1_0/1_1 with CRC scrambled by C-RNTI, CS-RNTI,        TC-RNTI

The described RNTIs may follow the following definition and purpose.

C-RNTI (Cell RNTI): terminal-specific PDSCH scheduling purpose

TC-RNTI (Temporary Cell RNTI): terminal-specific PDSCH schedulingpurpose

CS-RNTI (Configured Scheduling RNTI): for quasi-stationary configuredterminal-specific PDSCH scheduling

RA-RNTI (Random Access RNTI): for PDSCH scheduling in a random accessstage

P-RNTI (Paging RNTI): for PDSCH scheduling for transmission of paging

SI-RNTI (System Information RNTI): for PDSCH scheduling for transmissionof system information

INT-RNTI (Interruption RNTI): for notifying puncturing for PDSCH

TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): for indicating apower control command for PUSCH

TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): for indicating apower control command for PUCCH

TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): for indicating apower control command for SRS

In an embodiment of the disclosure, the foregoing DCI formats may bedefined as shown in [Table 9].

TABLE 9 DCI format Usage 0_0 Scheduling of PUSCH in one cell 0_1Scheduling of PUSCH in one cell 1_0 Scheduling of PDSCH in one cell 1_1Scheduling of PDSCH in one cell 2_0 Notifying a group of UEs of the slotformat 2_1 Notifying a group of UEs of the PRB(s) and OFDM symbol(s)where UE may assume no transmission is intended for the UE 2_2Transmission of TPC commands for PUCCH and PUSCH 2_3 Transmission of agroup of TPC commands for SRS transmissions by one or more UEs

According to an embodiment of the disclosure, in 5G system, a pluralityof search space sets may be configured with different parameters (e.g.,parameters of [Table 8]). Thus, a group of search space sets monitoredby the terminal may vary at every point in time. For example, when thesearch space set #1 is configured with an X-slot period, the searchspace set #2 is configured with a Y-slot period, and X and Y aredifferent from each other, the terminal may monitor both the searchspace set #1 and the search space set #2 in a certain slot and one ofthem in another certain slot.

When the plurality of search space sets are configured for the terminal,the following conditions may be considered to determine a search spaceset to be monitored by the terminal.

[Condition 1: Restriction on the Maximum Number of PDCCH Candidates]

the number of PDCCH candidates to be monitored per slot may not exceedM^(μ). M^(μ) may be defined as the maximum number of PDCCH candidatesper slot in a cell configured with a subcarrier spacing of 15·2^(μ) kHz,as shown in [Table 10].

TABLE 10 Maximum number of PDCCH candidates per slot μ and per servingcell (M^(μ)) 0 44 1 36 2 22 3 20

[Condition 2: Restriction on a Maximum Number of CCEs]

The number of CCEs constituting the entire search space per slot(herein, the entire search space may refer to the entire CCE setcorresponding to a union region of a plurality of search space sets) maynot exceed C^(μ). C^(μ) may be defined as the maximum number of CCEs perslot in a cell configured with a subcarrier spacing of 15·2^(μ) kHz, asshown in [Table 11].

TABLE 11 Maximum number of CCEs per slot μ and per serving cell (C^(μ))0 56 1 56 2 48 3 32

For convenience of a description, a situation satisfying both Condition1 and Condition 2 at a certain point in time may be defined as“Condition A”, for example. Thus, failing to satisfy Condition A maymean that at least one of Condition 1 or Condition 2 is not satisfied.

Depending on configuration of search space sets by the base station,Condition A may not be satisfied at a certain point in time. WhenCondition A is not satisfied at a certain point in time, the terminalmay select and monitor some of search space sets configured to satisfyCondition A at the point in time, and the base station may transmit thePDCCH through the selected search space set.

According to an embodiment of the disclosure, the following method maybe used to select some search space of the configured search space set.

[Method 1]

When Condition A for the PDCCH is not satisfied at a certain point intime (slot),

the terminal (or the base station) may preferentially select a searchspace set of a search space type configured as a common search spaceover a search space set of a search space type configured as aterminal-specific search space among search space sets existing at acertain point in time.

When all the search space sets set as the common search spaces areselected (i.e., Condition A is satisfied even after selection of all thesearch space sets configured as the common search spaces), the terminal(or the base station) may select a search space set that is configuredfor the terminal-specific search space. When a plurality of search spacesets are configured as terminal-specific search spaces, the terminal orthe base station may select the terminal-specific search space sets in arange where Condition A is satisfied, based on priority. For example, asearch space set having a lower search space set index may have a higherpriority.

In the following description, time and frequency resource allocationmethods for data transmission in NR system will be described.

In NR system, in addition to frequency-domain resource candidateallocation through a BWP indication, the following detailedfrequency-domain resource allocation (FD-RA) methods may be provided.

FIG. 6 illustrates an example of frequency-domain resource allocation ofa physical downlink shared channel (PDSCH) in a wireless communicationsystem, according to an embodiment of the disclosure.

In FIG. 6, three FD-RA methods of type 0 6-00, type 1 6-05, and dynamicswitch 6-10 that may be configured through a higher layer in NR areshown.

Referring to FIG. 6, when the terminal is configured to use resourcetype 0 6-00 through higher-layer signaling, the DCI for allocating thePDSCH to the terminal may include a bitmap including NRBG bits. Theconditions for the descriptions above will be described again below. TheNRBG may mean the number of resource block groups (RBGs) determined asshown in [Table 12] based on a BWP size allocated by a BWP indicator anda higher-layer parameter rbg-Size, and data may be transmitted in an RBGindicated as “1” by the bitmap.

TABLE 12 Bandwidth Part Size Configuration 1 Configuration 2  1-36 2 437-72 4 8  73-144 8 16 145-275 16 16

When the terminal is configured to use resource type 1 6-05 throughhigher-layer signaling, some DCI for allocating a PDSCH to the terminalmay have frequency-domain resource allocation information including

┌log₂(N_(RB) ^(DL,BWP)(N_(RB) ^(DL,BWP)+1)/2)┐

bits. The conditions for the descriptions above will be described againbelow. In this way, the base station may configure a starting VRB 6-20and a length 6-25 of frequency-domain resources consecutively allocatedtherefrom.

When the terminal is configured to use both resource 0 and resource type1 6-10 through higher-layer signaling, some DCI for allocating the PDSCHto the terminal may include frequency-domain resource allocationinformation including bits of the largest value 6-35 among a payload6-15 for setting resource type 0 and payloads 6-20 and 6-25 for settingresource type 1. The conditions for the descriptions above will bedescribed again below. In this case, one bit may be added to theforemost (a most significant bit (MSB)) of frequency-domain resourceallocation information in DCI, and when the bit of 0 is used, theresource type 0 may be indicated to be used, and when the bit of 1 isused, the resource type 1 may be indicated to be used.

FIG. 7 illustrates an example of time-domain resource allocation of aphysical downlink shared channel (PDSCH) in a wireless communicationsystem, according to an embodiment of the disclosure.

The following description will be made of a method of time-domainresource allocation with respect to a data channel in a wirelesscommunication system (e.g., a 5G or NR system).

The base station may configure the terminal with a table regardingtime-domain resource allocation information for a PDSCH and a PUSCHthrough higher layer signaling (e.g., RRC signaling). A table includingthe maximum of maxNrofDL-Allocations=16 entries may be configured forthe PDSCH, and a table including the maximum of maxNrofUL-Allocations=16entries may be configured for the PUSCH. In an embodiment of thedisclosure, time-domain resource allocation information may include aPDCCH-to-PDSCH slot timing (a time interval in the unit of a slotbetween a timing to receive the PDCCH and a timing to transmit the PDSCHscheduled by the received PDCCH, indicated by K0), a PDCCH-to-PUSCH slottiming (a time interval in the unit of a slot between a timing toreceive the PDCCH and a timing to transmit the PUSCH scheduled by thereceived PDCCH, indicated by K2), information about a position and alength of a start symbol scheduled by the PDSCH or the PUSCH in a slot,a mapping type of the PDSCH or the PUSCH, etc. For example, informationlike [Table 13] or [Table 14] may be notified from the base station tothe terminal.

TABLE 13 PDSCH-TimeDomainResourceAllocationList information element --ASN1START -- TAG-PDSCH-TIMEDOMAINRESOURCEALLOCATIONLIST-STARTPDSCH-TimeDomainResourceAllocationList ::= SEQUENCE(SIZE(1..maxNrofDL-Allocations)) OF PDSCH- TimeDomainResourceAllocationPDSCH-TimeDomainResourceAllocation ::= SEQUENCE { k0 INTEGER(0..32)OPTIONAL, -- Need S mappingType ENUMERATED {typeA, typeB},startSymbolAndLength INTEGER (0..127) }

TABLE 14 PUSCH-TimeDomainResourceAllocation information elementPUSCH-TimeDomainResourceAllocationList ::= SEQUENCE(SIZE(1..maxNrofUL-Allocations)) OF PUSCH- TimeDomainResourceAllocationPUSCH-TimeDomainResourceAllocation ::= SEQUENCE { k2 INTEGER(0..32)OPTIONAL, -- Need S mappingType ENUMERATED {typeA, typeB},startSymbolAndLength INTEGER (0..127) }

The base station may notify the terminal of one of the entries of thetable regarding the time-domain resource allocation information throughL1 signaling (e.g., the DCI) (e.g., the time-domain resource allocationinformation may be indicated by a ‘time-domain resource allocation’ inthe DCI). The terminal may obtain time-domain resource allocationinformation for the PDSCH or the PUSCH based on the DCI received fromthe base station.

For example, FIG. 7 shows an example of time-domain resource allocationof NR system.

Referring to FIG. 7, the base station may indicate a time-domainposition of a PDSCH resource according to a start position 7-00 and alength 7-05 of OFDM symbols in one slot dynamically indicated bysubcarrier spacings (SCS) (μ_(PDSCH), μ_(PDCCH)) of a data channel and acontrol channel configured using a higher layer, a scheduling offset K₀,and DCI.

FIG. 8 illustrates an example of time-domain resource allocation withrespect to subcarrier spacing of a data channel and a control channel ina wireless communication system, according to an embodiment of thedisclosure.

Referring to FIG. 8, when SCS of the data channel and SCS of the controlchannel are equal to each other as indicated by 8-00 μ_(PDSCH)=μ_(PDCCH)slot numbers for data and control are the same as each other, such thatthe base station and the terminal may recognize occurrence of schedulingoffset according to predefined slot offset K₀. On the other hand, whenSCS of the data channel and SCS of the control channel are differentfrom each other as indicated by 8-05 μ_(PDSCH)≠μ_(PDCCH) slot numbersfor data and control are different from each other, such that the basestation and the terminal may recognize occurrence of scheduling offsetaccording to predefined slot offset K₀, based on an SCS of the PDCCH.

In LTE system and NR system, in a state of being connected to a servingbase station, the terminal may report a capability supported by theterminal to the serving base station. In the following description, thiswill be referred to as UE capability (report). The base station maytransmit a UE capability enquiry message requesting a capability reportto the terminal in the connected state. The UE capability enquirymessage may include a radio access technology (RAT) type-specific UEcapability request by the base station. The RAT type-specific requestmay include a frequency band information to request. Through the UEcapability enquiry message, a plurality of RAT types may be requested inone RRC message container, or the UE capability enquiry messageincluding each RAT type-specific request may be included a plurality oftimes and transmitted to the terminal. That is, the UE capabilityenquiry may be repeated a plurality of times, and the terminal mayconfigure the corresponding UE capability information message and mayreport the same a plurality of times. In the wireless communicationsystem, terminal capability requesting for MR-DC as well as NR, LTE, andEN-DC may be performed. For reference, the UE capability enquiry messagemay be generally transmitted at an initial stage after the terminalperforms connection, but may also be transmitted on any condition whenneeded by the base station.

In this stage, the terminal having received the UE capability reportrequest from the base station may configure a terminal capability basedon RAT type and band information requested from the base station. In theNR system, the terminal may configure the UE capability as below.

1. When the terminal is provided with a list of LTE and/or NR bands fromthe base station in response to the UE capability request, the terminalmay configure a band combination (BC) for EN-DC and NR stand-alone (SA).That is, the terminal may configure a candidate BC list for EN-DC and NRSA, based on the bands requested to the base station throughFreqBandList. The band may also have a priority as written inFreqBandList.

2. When the base station sets an “eutra-nr-only” flag or an “eutra” flagand requests UE capability report, the terminal may completely removethose related to NR SA BCs from the configured candidate BC list. Thisoperation may be performed when an LTE base station (eNB) requests an“eutra” capability.

3. Thereafter, the terminal may remove fallback BCs from the configuredcandidate BC list. Herein, the fallback BC may correspond to a casewhere a band corresponding to at least one SCell is removed from acertain super set BC, and the super set BC is already capable ofcovering the fallback BC and thus the fallback BC can be omitted. Thisoperation may also be applied in the MR-DC, i.e., LTE bands. The BCremaining after this operation may be a final “candidate BC list”.

4. The terminal may select BCs to be reported by selecting BCs suitablefor the requested RAT type from the final “candidate BC list”. In thisstep, the terminal may configure supportedBandCombinationList in adetermined order. That is, the terminal may configure a BC to bereported and a UE capability according to a preset RAT-type order.(nr->eutra-nr->eutra). The terminal may configure featureSetCombinationfor configured supportedBandCombinationList and may configure a list of“candidate feature set combinations” in the candidate BC list from whicha list of fallback BCs (having capabilities of the same or lower level)is removed. The “candidate feature set combination” may include allfeature set combinations for NR and EUTRA-NR BCs and may be obtainedfrom a feature set combination of UE-NR-Capabilities and aUE-MRDC-Capabilities container.

5. When the requested RAT type is an EUTRA-NR and has an influence,featureSetCombinations may be included in two containers ofUE-MRDC-Capabilities and UE-NR-Capabilities. However, a feature set ofNew Radio (NR) may include UE-NR-Capabilities alone.

After the UE capability is configured, the terminal may transmit a UEcapability information message including the UE capability to the basestation. The base station may perform scheduling and transmission andreception management that are appropriate for the terminal, based on theUE capability received from the terminal.

NR system may have a CSI framework for indicating, in the base station,CSI measurement and report of the terminal. The CSI framework of NRsystem may include at least two elements of resource setting and reportsetting, in which report setting may have a relationship by referring toat least one of IDs of resource setting.

According to an embodiment of the disclosure, resource setting mayinclude information related to a reference signal (RS) for CSImeasurement of the terminal. The base station may configure at least oneresource setting for the terminal. For example, the base station and theterminal may transmit and receive signaling information as shown in[Table 15] to transmit information about resource setting.

TABLE 15 -- ASN1START -- TAG-CSI-RESOURCECONFIG-START CSI-ResourceConfig::= SEQUENCE { csi-ResourceConfigId CSI-ResourceConfigId,csi-RS-ResourceSetList  CHOICE { nzp-CSI-RS-SSB SEQUENCE {nzp-CSI-RS-ResourceSetList SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-ResourceSetsPerConfig)) OF NZP-CSI-RS-ResourceSetId OPTIONAL, -- NEED Rcsi-SSB-ResourceSetList SEQUENCE (SIZE(1..maxNrofCSI-SSB-ResourceSetsPerConfig)) OF CSI-SSB-ResourceSetIdOPTIONAL -- Need R }, csi-IM-ResourceSetList SEQUENCE (SIZE(1..maxNrofCSI-IM-ResourceSetsPerConfig)) OF CSI-IM-ResourceSetId },bwp-Id  BWP-Id, resourceType ENUMERATED { aperiodic, semiPersistent,periodic }, ... } -- TAG-CSI-RESOURCECONFIG-STOP -- ASN1STOP

In [Table 15], signaling information “CSI-ResourceConfig” may includeinformation about each resource setting. According to signalinginformation, each resource setting may include a resource setting indexcsi-ResourceConfigld, a BWP index bwp-ID, resource time-domaintransmission setting (resourceType), or a resource set listcsi-RS-ResourceSetList including at least one resource set. Time-domaintransmission of resources may be set to aperiodic transmission,semi-persistent transmission, or periodic transmission. A resource setlist may be a group of resource sets for channel measurement or a groupof resource sets for interference measurement. When the resource setlist is the group including resource sets for channel measurement, eachresource set may include at least one resource, which may be an index ofa CSI-RS resource or an SS/PBCH block (SSB). When the resource set listis the group including the resource sets for interference measurement,each resource set may include at least one CSI-interference measurement(CSI-IM) resource.

For example, when the resource set includes a CSI-RS, the base stationand the terminal may exchange signaling information as shown in [Table16] to transmit information about a resource set.

TABLE 16 -- ASN1START -- TAG-NZP-CSI-RS-RESOURCESET-STARTNZP-CSI-RS-ResourceSet ::= SEQUENCE { nzp-CSI-ResourceSetIdNZP-CSI-RS-ResourceSetId, nzp-CSI-RS-Resources SEQUENCE (SIZE(1..maxNrofNZP-CSI-RS-ResourcesPerSet)) OF NZP-CSI-RS-ResourceId,repetition  ENUMERATED { on, off } OPTIONAL, -- Need SaperiodicTriggeringOffset  INTEGER(0..6) OPTIONAL, -- Need S trs-Info ENUMERATED {true} OPTIONAL, -- Need R ... } --TAG-NZP-CSI-PS-RESOURCESET-STOP -- ASN1STOP

In [Table 16], signaling information NZP-CSI-RS-ResourceSet may includeinformation about each resource set. According to the signalinginformation, each resource set may include information about a resourceset index nzp-CSI-ResourceSetId or an index group nzp-CSI-RS-Resourcesof an included CSI-RS, and include a part of information (repetition)about a spatial domain transmission filter of an included CSI-RSresource or a part of information of tracking usage trs-Info of theincluded CSI-RS resource.

The CSI-RS may be the most representative RS included in the resourceset. The base station and the terminal may exchange signalinginformation as shown in [Table 17] to transmit information about theCSI-RS resource.

TABLE 17 -- ASN1START -- TAG-NZP-CSI-RS-RESOURCE-STARTNZP-CSI-RS-Resource ::= SEQUENCE { nzp-CSI-RS-ResourceId NZP-CSI-RS-ResourceId, resourceMapping  CSI-RS-ResourceMapping,powerControlOffset  INTEGER (−8..15), powerControlOffsetSS ENUMERATED{db−3, db0, db3, db6} OPTIONAL, -- Need R scramblingIDScramblingId, periodicityAndOffset  CSI-ResourcePeriodicityAndOffsetOPTIONAL, -- Cond PeriodicOrSemiPersistent qcl-InfoPeriodicCSI-RSTCI-StateId OPTIONAL, -- Cond Periodic ... } --TAG-NZP-CSI-RS-RESOURCE-STOP -- ASN1STOP

In [Table 17], signaling information NZP-CSI-RS-Resource may includeinformation about each CSI-RS. Information included in the signalinginformation NZP-CSI-RS-Resource may have the following meaning:

-   -   nzp-CSI-RS-ResourceId: a CSI-RS resource index    -   resourceMapping: resource mapping information of a CSI-RS        resource    -   powerControlOffset: a rate between PDSCH EPRE (Energy Per Re)        and CSI-RS EPRE    -   powerControlOffsetSS: a rate between SS/PBCH block EPRE and        CSI-RS EPRE    -   scramblingID: a scrambling index of a CSI-RS sequence    -   periodicityAndOffset: a transmission period of a CSI-RS resource        and a slot offset    -   qcl-InfoPeriodicCSI-RS: TCI-state information for a periodic        CSI-RS when the CSI-RS is a periodic CSI-RS

resourceMapping included in the signaling informationNZP-CSI-RS-Resource may indicate resource mapping information of aCSI-RS resource, including frequency resource element (RE) mapping, aport number, symbol mapping, CDM type, a frequency resource density, andfrequency band mapping information. The port number, the frequencyresource density, the CDM type, and the time-frequency domain RE mappingconfigured in this way may have a value set to one of rows of [Table18].

TABLE 18 Ports Density CDM group Row X p cdm-Type (k, l) index j k′ l′ 11 3 No CDM (k₀, l₀), (k₀ + 4, l₀), (k₀ + 8, l₀) 0, 0, 0 0 0 2 1 1, 0.5NO CDM (k₀, l₀) 0 0 0 3 2 1, 0.5 FD-CDM2 (k₀, l₀) 0 0, 1 0 4 4 1 FD-CDM2(k₀, l₀), (k₀ + 2, l₀) 0, 1 0, 1 0 5 4 1 FD-CDM2 (k₀, l₀), (k₀, l₀ + 1)0, 1 0, 1 0 6 8 1 FD-CDM2 (k₀, l₀), (k₁, l₀), (k₂, l₀), (k₃, l₀) 0, 1,2, 3 0, 1 0 7 8 1 FD-CDM2 (k₀, l₀), (k₁, l₀), (k₀, l₀ + 1), (k₁, l₀ + 1)0, 1, 2, 3 0, 1 0 8 8 1 CDM4 (F (k₀, l₀), (k₁, l₀) 0, 1 0, 1 0, 1 D2,TD2) 9 12 1 FD-CDM2 (k₀, l₀), (k₁, l₀), (k₂, l₀), (k₃, l₀), (k₄, l₀),(k₅, l₀) 0, 1, 2, 3, 0, 1 0 4, 5 10 12 1 CDM4 (F (k₀, l₀), (k₁, l₀),(k₂, l₀) 0, 1, 2 0, 1 0, 1 D2, TD2) 11 16 1, 0.5 FD-CDM2 (k₀, l₀), (k₁,l₀), (k₂, l₀), (k₃, l₀), 0, 1, 2, 3, 0, 1 0 (k₀, l₀ + 1), (k₁, l₀ + 1),(k₂, l₀ + 1), (k₃, l₀ + 1) 4, 5, 6, 7 12 16 1, 0.5 CDM4 (F (k₀, l₀),(k₁, l₀), (k₂, l₀), (k₃, l₀) 0, 1, 2, 3 0, 1 0, 1 D2, TD2) 13 24 1, 0.5FD-CDM2 (k₀, l₀), (k₁, l₀), (k₂, l₀), (k₀, l₀ + 1), (k₁, l₀ + 1), (k₂,l₀ + 1), 0, 1, 2, 3, 0, 1 0 (k₀, l₁), (k₁, l₁), (k₂, l₁), (k₀, l₁ + 1),(k₁, l₁ + 1), (k₂, l₁ + 1) 4, 5, 6, 7, 8, 9, 10, 11 14 24 1, 0.5 CDM4 (F(k₀, l₀), (k₁, l₀), (k₂, l₀), (k₀, l₁), (k₁, l₁), (k₂, l₁) 0, 1, 2, 3,0, 1 0, 1 D2, TD2) 4, 5 15 24 1, 0.5 CDM8 (F (k₀, l₀), (k₁, l₀), (k₂,l₀) 0, 1, 2 0, 1 0, 1, 2, 3 D2, TD4) 16 32 1, 0.5 FD-CDM2 (k₀, l₀), (k₁,l₀), (k₂, l₀), (k₃, l₀), 0, 1, 2, 3, 0, 1 0 (k₀, l₀ + 1), (k₁, l₀ + 1),(k₂, l₀ + 1), (k₃, l₀ + 1), 4, 5, 6, 7, (k₀, l₁), (k₁, l₁), (k₂, l₁),(k₃, l₁), 8, 9, 10, 11, (k₀, l₁ + 1), (k₁, l₁ + 1), (k₂, l₁ + 1), (k₃,l₁ + 1) 12, 13, 14, 15 17 32 1, 0.5 CDM4 (F (k₀, l₀), (k₁, l₀), (k₂,l₀), (k₃, l₀), (k₀, l₁), (k₁, l₁), (k₂, l₁), (k₃, l₁) 0, 1, 2, 3, 0, 10, 1 D2, TD2) 4, 5, 6, 7 18 32 1, 0.5 CDM8 (F (k₀, l₀), (k₁, l₀), (k₂,l₀), (k₃, l₀) 0, 1, 2, 3 0, 1 0, 1, 2, 3 D2, TD4)

[Table 18] may indicate a frequency resource density, a CDM type,frequency-domain and time-domain start positions (k,l) of a CSI-RScomponent RE pattern, a frequency-domain RE number (k′) and atime-domain RE number (l′) of the CSI-RS component RE pattern that aresettable according to a CSI-RS port number X. The foregoing CSI-RScomponent RE pattern may be the basic unit forming a CSI-RS resource.Through Y=1+max(k′) REs of the frequency domain and Z=1+max(1′) REs ofthe time domain, a CSI-RS component RE pattern may include YZ REs. Whenthe CSI-RS port number is “1” port, a CSI-RS RE position may bedesignated without a restriction on a subcarrier in a PRB (PhysicalResource Block) and may be designated by a bitmap of 12 bits. For theCSI-RS port number of {2, 4, 8, 12, 16, 24, 32} and Y=2, a CSI-RS REposition may be designated for every two subcarriers in a PRB and may bedesignated by a bitmap of 6 bits. For a CSI-RS port number of 4 and Y=4,a CSI-RS RE position may be designated for every four subcarriers in aPRB and may be designated by a bitmap of 6 bits. Likewise, a time-domainRE position may be designated by a bitmap of a total of 14 bits. In thiscase, a length of a bitmap may change according to Z of [Table 18] asfrequency position designation, but a principle thereof is similar tothe foregoing description and thus a redundant description will beomitted.

According to an embodiment of the disclosure, report setting hasconnections with resource setting based on at least one ID of theresource setting and resource setting(s) having connections with reportsetting may provide configuration information including informationabout an RS for channel information measurement. When resourcesetting(s) having connections with report setting is used for channelinformation measurement, the measured channel information may be usedfor channel information reporting based on a reporting method configuredin report setting having the connections.

According to an embodiment of the disclosure, report setting may includeconfiguration information related to a CSI reporting method. Forexample, the base station and the terminal may exchange signalinginformation as shown in [Table 19] to transmit information about reportsetting.

TABLE 19 -- ASN1START -- TAG-CSI-REPORTCONFIG-START CSI-ReportConfig ::=SEQUENCE { reportConfigId  CSI-ReportConfigId, carrier ServCellIndexOPTIONAL, -- Need S resourcesForChannelMeasurement CSI-ResourceConfigId, csi-IM-ResourcesForInterference CSI-ResourceConfigId OPTIONAL, --Need Rnzp-CSI-RS-ResourcesForInterference  CSI-ResourceConfigId  OPTIONAL, --Need R reportConfigType  CHOICE { periodic  SEQUENCE { reportSlotConfig CSI-ReportPeriodicityAndOffset, pucch-CSI-ResourceList SEQUENCE (SIZE(1..maxNrofBWPs)) OF PUCCH-CSI- Resource }, semiPersistentOnPUCCHSEQUENCE { reportSlotConfig  CSI-ReportPeriodicityAndOffset,pucch-CSI-ResourceList SEQUENCE (SIZE (1..maxNrofBWPs)) OF PUCCH-CSI-Resource }, semiPersistentOnPUSCH SEQUENCE { reportSlotConfig ENUMERATED {sl5, sl10, sl20, sl40, sl80, sl160, sl320},reportSlotOffsetList SEQUENCE (SIZE (1.. maxNrofUL-Allocations)) OFINTEGER(0. .32), p0alpha  P0-PUSCH-AlphaSetId }, aperiodic  SEQUENCE {reportSlotOffsetList SEQUENCE (SIZE (1..maxNrofUL-Allocations)) OFINTEGER(0..32) } }, reportQuantity  CHOICE { none NULL, cri-RI-PMI-CQI NULL, cri-RI-i1  NULL, cri-RI-i1-CQI  SEQUENCE { pdsch-BundleSizeForCSIENUMERATED {n2, n4} OPTIONAL -- Need S }, cri-RI-CQI  NULL, cri-RSRP NULL, ssb-Index-RSRP NULL, cri-RI-LI-PMI-CQI  NULL },reportFreqConfiguration SEQUENCE { cqi-FormatIndicator  ENUMERATED {widebandCQI, subbandCQI } OPTIONAL, -- Need R pmi-FormatIndicator ENUMERATED { widebandPMI, subbandPMI } OPTIONAL, -- Need Rcsi-ReportingBand  CHOICE { subbands3 BIT STRING(SIZE(3)), subbands4 BITSTRING(SIZE(4)), subbands5 BIT STRING(SIZE(5)), subbands6 BITSTRING(SIZE(6)), subbands7 BIT STRING(SIZE(7)), subbands8 BITSTRING(SIZE(8)), subbands9 BIT STRING(SIZE(9)), subbands10 BITSTRING(SIZE(10)), subbands11 BIT STRING(SIZE(11)), subbands12 BITSTRING(SIZE(12)), subbands13 BIT STRING(SIZE(13)), subbands14 BITSTRING(SIZE(14)), subbands15 BIT STRING(SIZE(15)), subbands16 BITSTRING(SIZE(16)), subbands17 BIT STRING(SIZE(17)), subbands18 BITSTRING(SIZE(18)), ..., subbands19-v1530  BIT STRING(SIZE(19)) } OPTIONAL-- Need S }  OPTIONAL, -- Need R timeRestrictionForChannelMeasurements ENUMERATED {configured, notConfigured},timeRestrictionForInterferenceMeasurements ENUMERATED {configured,notConfigured}, codebookConfig  CodebookConfig OPTIONAL, -- Need R dummy ENUMERATED {n1, n2} OPTIONAL, -- Need R groupBasedBeamReporting  CHOICE{ enabled NULL, disabled SEQUENCE { nrofReportedRS  ENUMERATED {n1, n2,n3, n4} OPTIONAL -- Need S } }, cqi-Table ENUMERATED {table1, table2,table3, spare1} OPTIONAL, -- Need R subbandSize  ENUMERATED {value1,value2}, non-PMI-PortIndication  SEQUENCE (SIZE(1..maxNrofNZP-CSI-RS-ResourcesPerConfig)) OF PortIndexFor8RanksOPTIONAL, -- Need R ..., [[ semiPersistentOnPUSCH-v1530 SEQUENCE {reportSlotConfig-v1530 ENUMERATED {sl4, sl8, sl16} } OPTIONAL -- Need R]] }

In [Table 19], signaling information CSI-ReportConfig may includeinformation about each report setting. Information included in thesignaling information CSI-ReportConfig may have the following meaning:

-   -   reportConfigId: report configuration index    -   carrier: serving cell index    -   resourcesForChannelMeasurement: a resource setting index for        channel measurement having connections with report setting    -   csi-IM-ResourcesForInterference: a resource setting index for        CSI-IM for interference measurement having connections with        report setting    -   nzp-CSI-RS-ResourcesForInterference: a resource setting index        for CSI-RS index for interference measurement having connections        with report setting    -   reportConfigType: time-domain transmission setting and a        transmission channel of a channel report, which may have        configuration of aperiodic transmission, semi-persistent PUCCH        transmission, semi-periodic PUSCH transmission, or periodic        transmission    -   reportQuantity: a type of channel information to be reported,        which may have a type of channel information ‘cri-RI-PMI-CQI’,        ‘cri-RI-i1’, ‘cri-RI-i1-CQI’, ‘cri-RI-CQI’, ‘cri-RSRP’,        ‘ssb-Index-RSRP’, ‘cri-RI-LI-PMI-CQI’, for a case where a        channel report is not transmitted (‘none’) and a case where a        channel report is transmitted Herein, an element included in the        type of the channel information may mean a channel quality        indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS        resource indicator (CRI), an SS/PBCH block resource indicator        (SSBRI), a layer indicator (LI), a rank indicator (RI), and/or        an L1-reference signal received power (RSRP).    -   reportFreqConfiguration: whether channel information to be        reported includes information about the entire wideband or        information about each subband, in which when the channel        information includes the information about each subband,        configuration information about a subband including the channel        information    -   timeRestrictionForChannelMeasurements: whether to restrict the        time-domain regarding a reference signal for channel measurement        from reference signals to which the channel information to be        reported refers    -   timeRestrictionForInterferenceMeasurements: whether to restrict        the time-domain regarding a reference signal for interference        measurement from reference signals to which the channel        information to be reported refers    -   codebookConfig: codebook information to which channel        information to be reported    -   groupBasedBeamReporting: whether to perform beam grouping of a        channel report    -   cqi-Table: CQI table index to which channel information to be        reported refers    -   subbandSize: index indicating a subband size of channel        information    -   non-PMI-PortIndication: port mapping information which is to be        referred to when non-PMI channel information is reported

When the base station indicates a channel information report throughhigher-layer signaling or L1 signaling, the terminal may perform channelinformation reporting by referring to the configuration informationincluded in indicated report setting.

The base station may indicate a CSI report to the terminal throughhigher-layer signaling including RRC signaling or MAC CE signaling or L1signaling (e.g., common DCI, group-common DCI, terminal-specific DCI).

For example, the base station may indicate an aperiodic CSI report tothe terminal through higher-layer signaling or DCI using DCI format 0_1.The base station may configure a parameter for an aperiodic CSI reportof the terminal or multiple CSI report trigger states including aparameter for a CSI report through higher-layer signaling. The parameterfor the CSI report or the CSI report trigger state may include a groupincluding a slot interval between a PDCCH including DCI and a PUCCH orPUSCH including a CSI report or a possible slot interval, an RS ID forchannel state measurement, a type of included channel information, etc.When the base station indicates some of the multiple CSI report triggerstates to the terminal through the DCI, the terminal may report channelinformation according to CSI report configuration of report settingconfigured in the indicated CSI report trigger state. Time-domainresource allocation of a PUCCH or a PUSCH including a CSI report of theterminal may be indicated through a slot interval with a PDCCH indicatedthrough the DCI, indication of a start symbol and a symbol length in aslot for time-domain resource allocation of a PUSCH, and the entirePUCCH resource indication or a part thereof. For example, the positionof the slot in which the PUSCH including the CSI report of the terminalis transmitted may be indicated through the slot interval with the PDCCHindicated through the DCI, and the start symbol and the symbol length inthe slot may be indicated through a time-domain resource assignmentfield of the DCI.

For example, the base station may indicate a semi-persistent CSI reportto the terminal through higher-layer signaling or DCI using DCI format0_1. The base station may activate or deactivate a semi-persistent CSIreport through higher layer signaling including MAC CE signaling or DCIscrambled by SP-CSI-RNTI. Upon activation of the semi-persistent CSIreport, the terminal may periodically report channel informationaccording to the configured slot interval. Upon deactivation of thesemi-persistent CSI report, the terminal may stop the activated periodicchannel information report. The base station may configure a parameterfor a semi-persistent CSI report of the terminal or multiple CSI reporttrigger states including the parameter for the semi-persistent CSIreport through higher-layer signaling.

The parameter for the CSI report or the CSI report trigger state mayinclude a group including a slot interval between a PDCCH including DCIindicating a CSI report and a PUCCH or PUSCH including the CSI report ora possible slot interval, a slot interval between a slot activated byhigher layer signaling indicating the CSI report and a PUCCH or PUSCHincluding a CSI report, a slot interval period of the CSI report, a typeof channel information to include, etc. When the base station activatessome of the multiple CSI report trigger states or some of the multiplereport settings to the terminal through the higher-layer signaling orthe DCI, the terminal may report channel information according to reportsetting included in the indicated CSI report trigger state or CSI reportconfiguration configured in the activated report setting. Time-domainresource assignment of a PUCCH or a PUSCH including a CSI report of theterminal may be indicated through a slot interval period of a CSIreport, a slot interval with a slot in which higher-layer signaling isactivated, a slot interval with a PDCCH indicated through DCI,indication of a start symbol and a symbol length in a slot fortime-domain resource assignment of a PUSCH, and some or all of PUCCHresource indication thereof. For example, the position of the slot inwhich the PUSCH including the CSI report of the terminal is transmittedmay be indicated through the slot interval with the PDCCH indicatedthrough the DCI, and the start symbol and the symbol length in the slotmay be indicated through a time-domain resource assignment field of theDCI format 0_1. For example, a position of a slot in which the PUCCHincluding the CSI report of the terminal is transmitted may be indicatedby a slot interval period of the CSI report configured through higherlayer signaling and a slot interval between a slot in which higher layersignaling is activated and a slot of the PUCCH including the CSI report,and a start symbol in the slot and a symbol length may be indicatedthrough a start symbol and a symbol length allocated with a PUCCHresource configured through higher layer signaling.

For example, the base station may indicate a periodic CSI report to theterminal through higher layer signaling. The base station may activateor deactivate the periodic CSI report through higher layer signalingincluding RRC signaling. Upon activation of the periodic CSI report, theterminal may periodically report channel information according to theconfigured slot interval. Upon deactivation of the periodic CSI report,the terminal may stop the activated periodic channel information report.The base station may configure report setting including a parameter forthe periodic CSI report of the terminal through higher layer signaling.The parameter for the CSI report may include a slot interval between aslot in which higher layer signaling indicating the CSI report isactivated and the PUCCH or PUSCH including the CSI report, the slotinterval period of the CSI report, an RS ID for channel statemeasurement, a type of included channel information, etc. Time-domainresource assignment of the PUCCH or the PUSCH including the CSI reportof the terminal may be indicated through the slot interval period of theCSI report, the slot interval with the slot in which higher-layersignaling is activated, a slot interval with a PDCCH indicated throughDCI, indication of the start symbol and the symbol length in the slotfor time-domain resource assignment of the PUSCH, and some or all of thePUCCH resource indication. For example, the position of the slot inwhich the PUCCH including the CSI report of the terminal is transmittedmay be indicated by a slot interval period of the CSI report configuredthrough higher layer signaling and a slot interval between a slot inwhich higher layer signaling is activated and the PUCCH including theCSI report, and a start symbol in the slot and a symbol length may beindicated through a start symbol allocated with a PUCCH resourceconfigured through higher layer signaling and a symbol length.

When the base station indicates an aperiodic CSI report or asemi-persistent CSI report to the terminal through the DCI, the terminalmay determine whether valid channel reporting may be performed throughthe indicated CSI report, taking a CSI computation time necessary forthe CSI report into account. The terminal may perform valid CSIreporting from an uplink symbol after the Z symbol from the end of thelast symbol included in the PDCCH including the DCI indicating the CSIreport for the aperiodic CSI report or the semi-persistent CSI reportindicated by the DCI. The foregoing Z symbol may vary with numerology ofa downlink bandwidth part corresponding to the PDCCH including the DCIindicating the CSI report, numerology of an uplink bandwidth partcorresponding to the PUSCH transmitting the CSI report, or a type orcharacteristics (report quantity, frequency band granularity, a portnumber of an RS, a codebook type, etc.) of channel information reportedin the CSI report. In other words, for determining a certain CSI reportas a valid CSI report (for determining of a corresponding CSI report asa valid CSI report), uplink transmission of the CSI report should not beperformed prior to a Zref symbol including a timing advance. In thiscase, the Zref symbol is an uplink symbol in which a cyclic prefix (CP)starts after a time T_(proc,CSI)=(Z)(2048+144)·κ2^(−μ)·T_(C) from theend of the last symbol of the triggering PDCCH. Herein, a detailed valueof Z may follow the description provided below, andT_(c)=1/(Δf_(max)·N_(f)), Δf_(max)=480·10³ Hz, N_(f)=4096, κ=64, and μmay be numerology. In this case, μ may be agreed to use one of(μ_(PDCCH), μ_(CSI-RS), μ_(UL)), which causes the greatest T_(proc,CSI),and μ_(PDCCH) may mean a subcarrier spacing used for PDCCH transmission,μ_(CSI-RS) may mean a subcarrier spacing used for CSI-RS transmission,and μ_(UL) may mean a subcarrier spacing of an uplink channel used foruplink control information (UCI) transmission for CSI reporting. Inanother example, μ may be agreed to use one of (μ_(PDCCH), μ_(UL)),which causes the greatest T_(proc,CSI). Definitions of μ_(PDCCH) andμ_(UL) will refer to the above description. For convenience of thefollowing description, satisfying the foregoing condition may bereferred to as satisfying CSI reporting validity condition 1.

In addition, when the RS for channel measurement with respect to theaperiodic CSI report indicated to the terminal through the DCI is theaperiodic RS, the terminal may execute valid CSI reporting from anuplink symbol after a Z′ symbol from the end of the last symbolincluding the RS, in which the foregoing Z′ symbol may vary withnumerology of a downlink bandwidth part to which the PDCCH including theDCI indicating the CSI report corresponds, numerology of a bandwidth towhich an RS for channel measurement corresponds for the CSI report,numerology of an uplink bandwidth part corresponding to the PUSCHtransmitting the CSI report, or a type or characteristics (reportquantity, frequency band granularity, a port number of an RS, a codebooktype, etc.) of channel information reported in the CSI report. In otherwords, for identification of a certain CSI report as a valid CSI report(for identification of a corresponding CSI report as a valid CSIreport), uplink transmission of the CSI report should not be performedprior to a Zref′ symbol by including a timing advance. In this case, aZref symbol is an uplink symbol in which a cyclic prefix (CP) startsafter a time T′_(proc,CSI)=(Z′)(2048+144)·κ2^(−μ)·T_(C) from the end ofthe last symbol of the aperiodic CSI-RS or the aperiodic CSI-IMtriggered by the triggering PDCCH. Herein, a detailed value of Z′ mayfollow the description provided below, and T_(c)=1/(Δf_(max)·N_(f)),Δf_(max)=480·10³ Hz, N_(f)=4096, κ=64, and μ may be numerology. In thiscase, μ may be agreed to use one of (μ_(PDCCH), μ_(CSI-RS), μ_(UL)),which causes the greatest T_(proc,CSI), and μ_(PDCCH) may mean asubcarrier spacing used for PDCCH transmission, μ_(CSI-RS) may mean asubcarrier spacing used for CSI-RS transmission, and μ_(UL) may mean asubcarrier spacing of an uplink channel used for UCI transmission forCSI reporting. In another example, μ may be agreed to use one of(μ_(PDCCH), μ_(UL)) which causes the greatest T_(proc,CSI). In thiscase, definitions of μ_(PDCCH) and μ_(UL) will refer to the abovedescription. For convenience of the following description, satisfyingthe foregoing condition may be referred to as satisfying CSI reportingvalidity condition 2.

When the base station indicates the aperiodic CSI report for theaperiodic RS to the terminal through the DCI, the terminal may performvalid CSI reporting from the first uplink symbol which satisfies both apoint in time after the Z symbol from the end of the last symbolincluded in the PDCCH including the DCI indicating the CSI report and apoint in time after the Z′ symbol from the end of the last symbolincluding the RS. That is, for aperiodic CSI reporting based on theaperiodic RS, the CSI report may be identified as a valid CSI reportwhen both CSI reporting validity conditions 1 and 2 are satisfied.

When a CSI reporting time indicated by the base station fails to satisfyCSI computation time requirements, the terminal may identify the CSIreport as being invalid and may not consider updating of a channelinformation state for the CSI report.

The Z and Z′ symbols for calculation of the foregoing CSI computationtime may follow [Table 20] and [Table 21]. For example, when channelinformation reported in the CSI report includes wideband information, aport number of the RS is less than or equal to 4, the number of RSresources is one, and a codebook type is ‘typeI-SinglePanel’ or a type(report quantity) of channel information to be reported is ‘cri-RI-CQI’,the Z and Z′ symbols may follow the value Z₁,Z₁′ of [Table 21]. Thiswill be referred to as a delay requirement 2. In addition, when thePUSCH including the CSI report does not include a TB or a hybridautomatic request (HARQ)-acknowledgement (ACK) and a CPU occupation ofthe terminal is 0, the Z and Z′ symbols may follow the value Z₁,Z₁′ of[Table 20], which will be referred to as a delay requirement 1. Theabove-described CPU occupation will be described below in detail. Whenthe report quantity is ‘cri-RSRP’ or ‘ssb-Index-RSRP’, the Z and Z′symbols may follow the value Z₃,Z₃′ of [Table 21]. X₁, X₂, X₃, and X₄ of[Table 21] may mean a terminal's capability (UE capability) for a beamreporting time, and KB₁ and KB₂ of [Table 21] may mean a terminal'scapability for a beam changing time. When not corresponding to the typeor characteristics of the channel information to be reported in the CSIreport, the Z and Z′ symbols may follow the value of Z₂,Z₂′ [Table 21].

TABLE 20 Z₁ [symbols] μ Z₁ Z′₁ 0 10 8 1 13 11 2 25 21 3 43 36

TABLE 21 Z₁ [symbols] Z₂ [symbols] Z₃ [symbols] μ Z₁ Z′₁ Z₂ Z′₂ Z₃ Z′₃ 022 16 40 37 22 X₁ 1 33 30 72 69 33 X₂ 2 44 42 141 140 min(44, X₃ + KB₁)X₃ 3 97 85 152 140 min(97, X₄ + KB₂) X₄

When the base station indicates an aperiodic/semi-persistent/periodicCSI report to the terminal, the base station may configure a CSIreference resource in the unit of a slot to determine a reference timeof the RS for channel information measurement reported in the CSIreport. For example, when transmission of a CSI report #X in an uplinkslot n′ is indicated, a CSI reference resource of the CSI report #X tobe transmitted in the uplink slot n′ may be defined as a downlink slotn-n_(CSI-ref). The downlink slot n may be calculated as n=└n′·2^(μ)^(DL) /2^(μ) ^(DL) ┘, considering numerologies μ_(DL) and μ_(UL) of thedownlink and the uplink. When a CSI report #0 to be transmitted in theuplink slot n′ is a semi-persistent or periodic CSI report, a slotinterval n_(CSI-ref) between the downlink slot n and the CSI referenceresource may follow n_(CSI-ref)=4·2^(μ) ^(DL) when a single CSI-RSresource is connected to the CSI report and follow n_(CSI-ref)=5·2^(μ)^(DL) when multiple CSI-RS resources are connected to the CSI report,depending on the number of CSI-RS resources for channel measurement.When the CSI report #0 transmitted in the uplink slot n′ is theaperiodic CSI report, CSI report #0 may be calculated as n^(n)^(CSI-ref) =└Z′/N_(symb) ^(slot)┘ based on a CSI computation time Z′ forchannel measurement. The foregoing N_(symb) ^(slot) may mean the numberof symbols included in one slot, and N_(symb) ^(slot)=14 is assumed inNR system.

When the base station indicates to the terminal to transmit a certainCSI report in the uplink slot n′ through higher layer signaling or DCI,the terminal may report the CSI by performing channel measurement orinterference measurement with respect to a CSI-RS resource, a CSI-IMresource, and an SSB resource transmitted not later than a CSI referenceresource slot of a CSI report to be transmitted in the uplink slot n′between the CSI-RS resource, the CSI-IM resource, or the SSB resourceassociated with the CSI report. The CSI-RS resource, the CSI-IMresource, or the SSB resource associated with the CSI report may meanthe CSI-RS resource, the CSI-IM resource, or the SSB resource includedin the resource set configured in resource setting referred to by thereport setting for the CSI report of the terminal, configured throughhigher layer signaling, the CSI-RS resource, the CSI-IM resource, or theSSB resource referred to by a CSI report trigger state including theparameter for the CSI report, or the CSI-RS resource, the CSI-IMresource, or the SSB resource indicated by the ID of the RS group.

In embodiments of the disclosure, CSI-RS/CSI-IM/SSB occasions may meantransmission points in time of CSI-RS/CSI-IM/SSB resource(s) determinedby higher layer configuration or a combination of higher layerconfiguration and DCI triggering. For example, a slot in which asemi-persistent or periodic CSI-RS resource is to be transmitted may bedetermined based on a slot period and a slot offset configured throughhigher layer signaling, and transmission symbol(s) in the slot may bedetermined by referring to one of resource mapping methods in the slotin [Table 18] according to resource mapping information resourceMapping.In another example, a slot in which an aperiodic CSI-RS resource is tobe transmitted may be determined based on a slot offset with a PDCCHincluding DCI indicating a channel report configured through higherlayer signaling, and transmission symbol(s) in the slot may bedetermined by referring to one of resource mapping methods in the slotin [Table 18] according to resource mapping information resourceMapping.

The above-described CSI-RS occasion may be determined by independentlyconsidering a transmission point in time of each CSI-RS resource or bycollectively considering transmission points in time of one or moreCSI-RS resource(s) included in a resource set, such that the followingtwo analyses may be possible for a CSI-RS occasion corresponding to eachresource set configuration.

-   -   Analysis 1-1: from the start point of the earliest symbol in        which one certain resource among one or more CSI-RS resources        included in resource set(s) configured in resource setting        referred to by report setting configured for the CSI report is        transmitted, to the end point of the last symbol in which the        certain resource is transmitted; and    -   Analysis 1-2: from the start point of the earliest symbol in        which a CSI-RS transmitted in the earliest point in time among        all the CSI-RS resources included in resource set(s) configured        in resource setting referred to by report setting configured for        the CSI report is transmitted, to the end point of the last        symbol in which a CSI-RS transmitted in the last point in time        among them is transmitted.

Hereinbelow, in embodiments of the disclosure, by considering both ofthe two analyses for CSI-RS occasion, separate application may bepossible. Moreover, both of the two analyses for CSI-IM occasion and SSBoccasion may be considered as in CSI-RS occasion, but a principlethereof is similar to the foregoing description, such that a redundantdescription will be avoided below.

In embodiments of the disclosure, CSI-RS/CSI-IM/SSB occasions for CSIreport #X transmitted in an uplink slot n′ may mean a set of a CSI-RSoccasion, a CSI-IM occasion, and an SSB occasion which are not laterthan a CSI reference resource of the CSI report #X transmitted in theuplink slot n′ among CSI-RS occasions, CSI-IM occasions, and SSBoccasions of CSI-RS resources, CSI-IM resources, and SSB resourcesincluded in a resource set configured in resource setting referred to byreport setting configured for the CSI report #X.

In embodiments of the disclosure, the last CSI-RS/CSI-IM/SSB occasionamong the CSI-RS/CSI-IM/SSB occasions for the CSI report #X transmittedin the uplink slot n′ may be analyzed in two manners as below.

-   -   Analysis 2-1: a set of occasions including the last CSI-RS        occasion among CSI-RS occasions for CSI report #X transmitted in        the uplink slot n′, the last CSI-IM occasion among the CSI-IM        occasions for the CSI report #X transmitted in the uplink slot        n′, and the last SSB occasion among SSB occasions for CSI report        #0 transmitted in the uplink slot n′; and    -   Analysis 2-2: the last occasion among all of CSI-RS occasions,        CSI-IM occasions, and SSB occasions for the CSI report #X        transmitted in the uplink slot n′.

Hereinbelow, in embodiments of the disclosure, both of the two analysesfor the last CSI-RS/CSI-IM/SSB occasion among the CSI-RS/CSI-IM/SSBoccasions for the CSI report #X transmitted in the uplink slot n′ may beconsidered for separate application. Given the foregoing two analyses(Analysis 1-1 and Analysis 1-2) for the CSI-RS occasion, the CSI-IMoccasion, and the SSB occasion, for “the last CSI-RS/CSI-IM/SSB occasionamong the CSI-RS/CSI-IM/SSB occasions for the CSI report #X transmittedin the uplink slot n”, separate application may be possible byconsidering four different analyses (application of Analysis 1-1 andAnalysis 2-1, application of Analysis 1-1 and Analysis 2-2, andapplication of Analysis 1-2 and Analysis 2-1) in the embodiments of thedisclosure.

The base station may indicate a CSI report, taking account of the amountof channel information that may be simultaneously computed by theterminal for the CSI report, i.e., the number of channel informationcomputation units (CSI processing units: CPUs) of the terminal. When thenumber of CPUs that may be simultaneously computed by the terminal isN_(CPU), the terminal may not expect a CSI report indication of the basestation, which needs channel information computation more than N_(CPU),or may not consider update of channel information which needs channelinformation computation more than N_(CPU). N_(CPU) may be reported bythe terminal to the base station through higher layer signaling or maybe configured by the base station through higher layer signaling.

The CSI report indicated by the base station to the terminal is assumedto occupy all CPUs or some of them for channel information computationamong a total number N_(CPU) of channel information that may besimultaneously computed by the terminal. When the number of CPUsrequired for each CSI report, e.g., a CSI report n (n=0, 1, . . . , N−1)is O_(CPU) ^((n)), the number of CPUs required for total N CSI reportsmay be Σ_(n=0) ^(n−1)O_(CPU) ^((n)). When the number of channelinformation computations needed by the terminal for multiple CSI reportsat a certain point in time is greater than the number N_(CPU) of CPUsthat may be simultaneously computed by the terminal, the terminal maynot consider update of channel information for some CSI reports. Amongthe indicated multiple CSI reports, a CSI report for which update ofchannel information is not considered may be determined at least basedon a time for which channel information computation required for the CSIreport occupies CPUs and an importance or a priority of channelinformation to be reported. For example, the time for which channelinformation computation required for the CSI report occupies the CPUsmay not consider update of channel information for a CSI report startingat the last point in time, and may not preferentially consider update ofchannel information for a CSI report corresponding to a low priority ofchannel information.

The CSI priority may be determined referring to [Table 22].

TABLE 22 CSI Priority Values Pri_(iCSI)(y, k, c, s) = 2 · N_(cells) ·M_(s) · y + N_(cells) · M_(s) · k + M_(s) · c + s, y = 0 For AperiodicCSI Report Transmitted through PUSCH, y = 1 For Semi-Persistent CSIReport Transmitted through PUSCH, y = 2 For Semi-Persistent CSI ReportTransmitted through PUCCH, y = 3 For Periodic CSI Report Transmittedthrough PUCCH; k = 0 For CSI Report Including L1-RSRP, k = 1 For CSIReport without L1-RSRP; c: Serving Cell Index, N_(cells): Maximum Numberof Serving Cells Set by Higher Layer Signaling (maxNrofServingCells); s:CSI Report Configuration Index (reportConfigID), M_(s): Maximum Numberof CSI Report Configurations Set by Higher Layer Signaling (maxNrofCSI-ReportConfigurations).

A CSI priority for a CSI report may be determined through priorityvalues Pri_(iCSI)(y,k,c,s) of [Table 22]. Referring to [Table 22], a CSIpriority value may be determined based on a type of channel informationincluded in the CSI report, time-domain report characteristics(aperiodic, semi-persistent, or periodic) of the CSI report, a channelin which the CSI report is transmitted (PUSCH or PUCCH), a serving-cellindex, and a CSI report configuration index. The CSI priority for theCSI report may be determined by comparing the priority valuesPri_(iCSI)(y,k,c,s) such that a CSI priority is higher for a CSI reporthaving a lower priority value.

When a time for which channel information computation required for a CSIreport indicated by the base station to the terminal occupies CPUs is aCPU occupation time, the CPU occupation time may be determinedconsidering a type (report quantity) of channel information included inthe CSI report, time-domain characteristics (aperiodic, semi-persistent,periodic) of the CSI report, a slot or a symbol occupied by higher layersignaling or the DCI indicating the CSI report, and some or all of aslot or a symbol occupied by an RS for channel state measurement.

FIG. 9 illustrates an example of a CPU occupation time for a CSI reportin which a report quantity included in the CSI report is not configuredto ‘none’, according to some embodiments of the disclosure.

9-00 of FIG. 9 illustrates an example of a CPU occupation time for anaperiodic CSI report in which a report quantity included in the CSIreport is not configured to ‘none’, according to some embodiments of thedisclosure. When the base station indicates transmission of aperiodicCSI report #X in the uplink slot n′ through DCI using DCI format 0_1, aCPU occupation time 9-05 for CSI report #X transmitted in the uplinkslot n′ may be defined as “from a symbol next to the last symboloccupied by a PDCCH 9-10 including DCI indicating aperiodic CSI report#0 to the last symbol occupied by a PUSCH 9-15 including the CSI report#X transmitted in the uplink slot n′”.

9-20 of FIG. 9 illustrates an example of a CPU occupation time for aperiodic or semi-persistent CSI report in which a report quantityincluded in the CSI report is not set to ‘none’, according to someembodiments of the disclosure. When the base station indicatestransmission of periodic or semi-persistent CSI report #X in the uplinkslot n′ through higher layer signaling or DCI using DCI format 0_1scrambled by an SP-CSI-RNTI, a CPU occupation time 9-25 for CSI report#X transmitted in the uplink slot n′ may be defined as “from the firstsymbol of the first transmitted CSI-RS/CSI-IM/SSB resource correspondingto the last CSI-RS/CSI-IM/SSB occasion 9-35 among CSI-RS/CS-IM/SSBoccasions for the CSI report #X transmitted in the uplink slot n′ to thelast symbol occupied by a PUCCH or PUSCH 9-35 including the CSI report#X transmitted in the uplink slot n′. Exceptionally, when the basestation indicates a semi-persistent CSI report through DCI such that theterminal performs a first CSI report of semi-persistent CSI report #X, aCPU occupation time for the first CSI report may be defined as “from asymbol next to the last symbol occupied by a PDCCH including DCIindicating the semi-persistent CSI report #X to the last symbol occupiedby a PUSCH including the first CSI report. In this way, time-domainoperation causality of the terminal may be guaranteed based on a pointin time at which a CSI report is indicated and a point in time at whicha CPU occupation time starts.

For example, the CPU occupation time may follow a rule as shown in[Table 23].

TABLE 23 For a CSI report with CSI-ReportConfig with higher layerparameter reportQuantity not set to ‘none’, the CPU(s) are occupied fora number of OFDM symbols as follows: A periodic or semi-persistent CSIreport (excluding an initial semi-persistent CSI report on PUSCH afterthe PDCCH triggering the report) occupies CPU(s) from the first symbolof the earliest one of each CSI- RS/CSI-IM/SSB resource for channel orinterference measurement, respective latest CSI-RS/CSI-IM/SSB occasionno later than the corresponding CSI reference resource, until the lastsymbol of the PUSCH/PUCCH carrying the report. An aperiodic CSI reportoccupies CPU(s) from the first symbol after the PDCCH triggering the CSIreport until the last symbol of the PUSCH carrying the report. Aninitial semi-persistent CSI report on PUSCH after the PDCCH triggeroccupies CPU(s) from the first symbol after the PDCCH until the lastsymbol of the PUSCH carrying the report.

FIG. 10 illustrates an example of a CPU occupation time for a CSI reportin which a report quantity included in the CSI report is set to ‘none’,according to some embodiments of the disclosure.

10-00 of FIG. 10 illustrates an example of a CPU occupation time for anaperiodic CSI report in which a report quantity included in the CSIreport is set to ‘none’, according to some embodiments of thedisclosure. When the base station indicates transmission of aperiodicCSI report #X in the uplink slot n′ through DCI using DCI format 0_1, aCPU occupation time 10-05 for CSI report #X transmitted in the uplinkslot n′ may be defined as “from a symbol next to the last symboloccupied by a PDCCH 10-10 including DCI indicating aperiodic CSI report#0 to a symbol in which CSI computation ends”. The above-describedsymbol in which CSI computation ends may mean the last symbol amongsymbols after a CSI computation time Z 10-15 of the last symbol occupiedby a PDCCH including DCI indicating the CSI report #0 and symbols aftera CSI computation time Z′ 10-25 of the last symbol of the latestCSI-RS/CSI-IM/SSB occasion 10-20 for the CSI report #0 transmitted inthe uplink slot n′.

10-30 of FIG. 10 illustrates an example of a CPU occupation time for aperiodic or semi-persistent CSI report in which a report quantityincluded in the CSI report is set to ‘none’, according to someembodiments of the disclosure. When the base station indicatestransmission of periodic or semi-persistent CSI report #X in the uplinkslot n′ through higher layer signaling or DCI using DCI format 0_1scrambled by an SP-CSI-RNTI, a CPU occupation time 10-35 for CSI report#X transmitted in the uplink slot n′ may be defined as “from the firstsymbol of the first transmitted CSI-RS/CSI-IM/SSB resource correspondingto each CSI-RS/CSI-IM/SSB occasion 10-40 for CSI report #X transmittedin the uplink slot n′ to symbols after a CSI computation time Z′ 10-45of the last symbol of the last transmitted CSI-RS/CS-IM/SB resource”.

For example, the CPU occupation time may follow a rule as shown in[Table 24].

TABLE 24 For a CSI report with CSI-ReportConfig with higher layerparameter reportQuantity set to ‘none’ and CSI-RS- ResourceSet withhigher layer parameter trs-Info is not configured, the CPU(s) areoccupied for a number of OFDM symbols as follows: A semi-persistent CSIreport (excluding an initial semi-persistent CSI report on PUSCH afterthe PDCCH triggering the report) occupies CPU(s) from the first symbolof the earliest one of each transmission occasion of periodic orsemi-persistent CSI-RS/SSB resource for channel measurement for L1-RSRPcomputation, until Z′₃ symbols after the last symbol of the latest oneof the CSI-RS/SSB resource for channel measurement for L1-RSRPcomputation in each transmission occasion. An aperiodic CSI reportoccupies CPU(s) from the first symbol after the PDCCH triggering the CSIreport until the last symbol between Z₃ symbols after the first symbolafter the PDCCH triggering the CSI report and Z′₃ symbols after the lastsymbol of the latest one of each CSI-RS/SSB resource for channelmeasurement for L1-RSRP computation.

In an unlicensed band (e.g., 5 GHz), a communication device (basestation or terminal) which is to perform communication may perform achannel access procedure or Listen before Talk (LBT) before signaltransmission, and perform signal transmission according to a result ofthe channel access procedure. For example, when the unlicensed band isdetermined to be in an idle state as the result of the channel accessprocedure, the communication device may transmit a signal, but when theunlicensed band is determined not to be in the idle state, thecommunication device may not be able to transmit a signal.

The channel access procedure may include measuring, by the communicationdevice, a strength of a signal received through the unlicensed band fora time calculated according to a set or predefined rule and comparingthe strength of the signal with a predefined threshold value or athreshold value calculated by a function including at least oneparameter among a channel bandwidth, a bandwidth of a signal in which atransmission signal is transmitted, and/or a strength of a transmissionpower, thus determining the idle state of the unlicensed band.

For example, the communication device may measure a strength of a signalreceived for X μs (e.g., 16 μs or 25 μs) immediately before a point intime to transmit a signal, and when the measured strength of the signalis less than a predefined or calculated threshold value T (e.g., −72dBm), the communication device may determine that the unlicensed band isin the idle state, and transmit the signal. A maximum time in whichsignal transmission is possible by occupying a channel after the channelaccess procedure may be restricted by a maximum channel occupancy time(MCOT) defined by a country, an area, and a frequency band for eachunlicensed band. The above-described maximum time may also be restrictedaccording to a type of the communication device (e.g., the base stationor the terminal, or a master device or a slave device). For example, inJapan, in a 5 GHz unlicensed band, for the unlicensed band determined tobe in the idle state after the channel access procedure, the basestation or the terminal may occupy a channel and transmit a signalwithout performing an additional channel access procedure for a maximumtime of 4 ms.

More specifically, the channel access procedure of the base station orthe terminal in the NR system may be roughly classified into fourcategories. For example, there may be a first category in which thechannel access procedure is not performed, a second category in whichthe channel access procedure is performed without random backoff, athird category in which the channel access procedure is performedthrough random backoff in a contention window of a fixed size, and afourth category in which the channel access procedure is performedthrough random backoff in a contention window of a variable size. Thechannel access procedure category may be classified into the followingchannel access procedure types:

-   -   Type 1: transmit an up/downlink signal or channel after        execution of a channel access procedure during a variable time;    -   Type 2: transmit an uplink/downlink signal or channel after        execution of a channel access procedure during a fixed time; and    -   Type 3: transmit a downlink or uplink signal or channel without        execution of a channel access procedure

According to an embodiment of the disclosure, a third category and afourth category for Type 1, a second category for Type 2, and a firstcategory for Type 3 may be examples. For Type 2 or the second categoryin which the channel access procedure is performed for a fixed time, itmay be classified into one or more types according to the fixed timeduring which the channel access procedure is executed. For example, Type2 may be classified into a type (Type 2-1) in which the channel accessprocedure is executed for a fixed time of A μs (e.g., 25 μs) and a type(Type 2-2) in which the channel access procedure is executed for a fixedtime of B μs (e.g., 16 μs).

The base station or the terminal that is to perform signal transmissionin the unlicensed band may determine a channel access procedure type (orscheme) according to a type of a signal or channel to be transmitted.For example, the base station may perform the channel access procedureof Type 1 when the base station transmits a downlink signal including adownlink data channel in the unlicensed band. When the base stationtransmits a downlink signal or channel that does not include a downlinkdata channel, for example, a synchronization signal or a downlinkcontrol channel, in the unlicensed band, the base station may executethe channel access procedure of Type 2 and transmit the signal orchannel.

In this case, a scheme of the channel access procedure may be determinedaccording to a transmission length of a signal or channel to betransmitted in the unlicensed band or a duration or a length of a periodin which the unlicensed band is used by being occupied. In general, inType 1, the channel access procedure needs to be executed for a longertime than execution of the channel access procedure in Type 2. Thus,when the base station or the terminal transmits a signal during a shorttime period or a reference time (e.g., X ms or Y symbol) or less, thebase station or the terminal may perform the channel access procedure ofType 2. On the other hand, when the base station or the terminaltransmits a signal during a long time period or the reference time(e.g., X ms or Y symbol) or more, the base station or the terminal mayperform the channel access procedure of Type 1. That is, a time in whichthe unlicensed band is used by being occupied may vary with the channelaccess procedure type of the unlicensed band.

In various embodiments of the disclosure, a parameter value (e.g., adefer duration corresponding to a determined channel access priority p,a set of contention window values or sizes CW_(p), a minimum valueCW_(min,p) and a maximum value CW_(max,p) of a contention window, and amaximum channel-occupiable duration T_(mcot,p)) corresponding to thechannel access priority type may be determined as shown in [Table 25].[Table 25] shows an example of a parameter for a channel access prioritytype for a downlink.

For example, the base station which is to transmit a downlink signal inthe unlicensed band may execute the channel access procedure for theunlicensed band during a minimum time of T_(f)+m_(p)*T_(sl) (e.g., adefer duration). When the base station is to execute the channel accessprocedure according to a channel access priority type 3 (p=3), for asize of a defer duration, T_(f)+m_(p)*T_(sl), required for execution ofthe channel access procedure, a size of T_(f)+m_(p)*T_(sl) may be setusing m_(p)=3. Herein, T_(f) is fixed to 16 μs, in which the first timeT_(sl) needs to be an idle state and during the remaining timeT_(f)-T_(sl) after the time T_(sl) in the time T_(f), the base stationmay not execute the channel access procedure. In this case, even whenthe base station executes the channel access procedure in the remainingtime T_(f)-T_(sl), a result of the channel access procedure may not beused. That is, the time T_(f)-T_(sl) may be a time that defers executionof the channel access procedure in the base station.

When the unlicensed band is determined to be in the idle state duringm_(p)*T_(sl), N=N−1. N may be selected as a random integer among thecontention window values CW_(p) at 0 and a point in time when thechannel access procedure is executed. For the channel access prioritytype 3, a minimum contention window value and a maximum contentionwindow value may be 15 and 63, respectively. When the unlicensed band isdetermined to be in the idle state in the defer duration and anadditional duration in which the channel access procedure is executed,the base station may transmit a signal in the unlicensed band during atime T_(mcot,p) of about 8 ms. While the description has been made basedon a downlink channel access priority class for convenience thereof, thechannel access priority class of [Table 25] may be equally used for anuplink or a separate channel access priority class for uplinktransmission may be used.

TABLE 25 Channel Access Allowed Priority Class (p) m_(p) CE_(min, p)CW_(max, p) T_(mcot, p) CW_(p) sizes 1 1 3 7 2 ms {3, 7}  2 1 7 15 3 ms{7, 15} 3 3 15 63 8 or 10 ms {15, 31, 63} 4 7 15 1023 8 or 10 ms {15,31, 63, 127, 255, 511, 1023}

In the NR system, one carrier may use a maximum frequency band of about100 MHz in a frequency band of about 7 GHz or lower. In this case, onecarrier may use a maximum frequency band of about 400 MHz in a frequencyband of about 7 GHz or higher or an ultra-high frequency band (mmWave).A partial unlicensed band (e.g., an unlicensed band near 5 GHz) may bedivided into 20 MHz channels, and by using each channel divided in theunit of 20 MHz, various communication devices may execute the channelaccess procedure. Thus, the NR system for performing communication inthe unlicensed band by using a wideband (e.g., a bandwidth wider than abandwidth of about 20 MHz) may execute the channel access procedure inthe unit of 20 MHz, thereby fairly using the unlicensed band with otherdevices and/or systems. In other words, in the base station and theterminal which perform communication by using an unlicensed carrier orcell or a bandwidth part of the carrier or cell, when the bandwidth ofthe carrier or cell or a bandwidth of the bandwidth part is greater thanabout 20 MHz, the bandwidth or the bandwidth part (hereinafter, referredto as the bandwidth part) may be divided into one or more subbands, andthe channel access procedure may be performed in the unit of a subbandor subband group. In this case, the subband may be divided based on thesize of the carrier bandwidth or the bandwidth part.

For example, the base station may divide the bandwidth part into aplurality of LBT subbands based on the size of the bandwidth part, whichis set for the terminal. That is, a bandwidth part of about 80 MHz maybe divided into four 20 MHz-based LBT subbands. The size of the LBTsubband may be equal to the size of the unlicensed-band channel or maybe a multiple thereof. The size of the LBT subband may be set through ahigher layer signal. The size of the LBT subband may be defined as thesize of the bandwidth or the number of PRBs. That is, the size of theLBT subband may be equal to the size of a 5 GHz unlicensed-band channel,about 20 MHz, or may be a multiple thereof, about 40 MHz or about 80MHz. In another example, the size of the LBT subband may be defined as XPRBs, in which a bandwidth corresponding to the X PRBs may be equal toor less than the size of the unlicensed-band channel, a bandwidth ofabout 20 MHz. Similarly, the size of the LBT subband may be defined as Yand/or Z PRBs corresponding to a bandwidth that is the same as orsmaller than a bandwidth of about 40 MHz or 80 MHz. In this case, X, Y,and Z for each bandwidth may be defined in advance between the basestation and the terminal. The size of at least one of LBT subbands maybe different from the sizes of the other LBT subbands. For example, whenthe size of the carrier bandwidth or the bandwidth part is 50 MHz, thecarrier bandwidth or the bandwidth part may be divided into three LBTsubbands. The sizes of the three LBT subbands may be about 20 MHz, about20 MHz, and about 10 MHz, respectively, or about 10 MHz, about 20 MHz,and about 20 MHz, respectively. The number of LBT subbands and/or thesize of each LBT subband is merely an example, and various examples maybe possible. That is, the carrier bandwidth or the bandwidth part of 50MHz may be divided into LBT subbands of about 40 MHz and LBT subbands ofabout 10 MHz. In the foregoing example, the size of each LBT subband maybe expressed as the number of PRBs.

This is described below in more detail with reference to FIG. 11. FIG.11 illustrates an example in which an LBT sub-band is divided in awireless communication system, according to various embodiments of thedisclosure.

FIG. 11 may be a view showing a case where the terminal performscommunication with the base station through two unlicensed carriers orcells 11-00 and 11-60 (hereinafter, referred to as cell #0 and cell #1).In this case, sizes of carrier bandwidths 11-05 and 11-65 of cell #0 andcell #1 may be the same as or different from each other. Moreover, theterminal may be configured with bandwidth parts 11-10 and 11-70 that arethe same as or smaller than bandwidths 11-05 and 11-65 of cell #0 andcell #1. In this case, configuration information (e.g., the size of abandwidth part) of the bandwidth parts 11-10 and 11-70 may be the sameas or different from each other. The base station may divide the carrierbandwidth 11-05 of cell #0 into N LBT subbands, in which the carrierbandwidth 11-65 or the bandwidth part 11-70 of cell #1 may not beseparately divided into LBT subbands or may be divided into one LBTsubband for execution of the channel access procedure. In this case, thebase station may divide the bandwidth part 11-10 of the terminal into MLBT subbands in cell #0. The base station may execute a channel accessprocedure including 11-25, 11-35, 11-45, and 11-55 and for an LBTsubband in cell #0 11-00 and a channel access procedure 11-75 forsubband #0 or the carrier or bandwidth part 11-70 in cell #1 11-60, andmay perform communication through an LBT subband determined to be in theidle state. Thus, as a resource region that may be transmitted andreceived by the terminal may change according to a result of the channelaccess procedure for each LBT subband of the base station, the terminalneeds to receive the result of the channel access procedure for eachsubband, executed by the base station, and in this way, the terminal maycorrectly determine a frequency resource region for uplink/downlink datachannel transmission/reception.

To this end, the base station may transmit the result of the channelaccess procedure to the terminal through a downlink control channel. Asthe result of the channel access procedure of the base station isinformation commonly applied to all terminals configured with abandwidth part including an LBT subband, the base station transmits theresult of the channel access procedure for each subband throughcell-common or group-common (GC) DCI, thereby minimizing signalingnecessary for transmission of the foregoing information to theterminals. In this case, the result of the channel access procedure ofthe base station may be transmitted to the terminal through terminal(UE)-specific DCI.

In various embodiments of the disclosure, information indicating theresult of the channel access procedure of the base station may bereferred to as ‘LBT result information’. In this case, the LBT resultinformation may be defined for each LBT subband, and may includeinformation indicating the result of the channel access procedure foreach LBT subband. The LBT result information may also be defined foreach carrier or cell, and may include information indicating the resultof the channel access procedure for each carrier or cell. When thecarrier or cell includes a plurality of subbands, the LBT resultinformation may also be defined for each carrier or cell and each LBTsubband, and may include information indicating the result of thechannel access procedure for each carrier or cell and each LBT subband.

The base station may transmit the result of the channel access procedurefor each LBT subband to the terminal by using a bitmap. For example, theresult of the channel access procedure for cell #0 11-00 including fourLBT subbands may be transmitted to the terminal through a 4-bit bitmapthat may be configured in an order sequentially from an LBT subband11-20 having a low LBT subband index to an LBT subband 11-50 having ahigh LBT subband. Each bit may indicate the result of the channel accessprocedure of the base station for each LBT subband. For example, bit 0may mean that the LBT subband is not in the idle state, and bit 1 maymean that the LBT subband is in the idle state. The foregoing bit valueis an example, and may be set reversely. Transmission of the result ofthe channel access procedure for each LBT subband to the terminal may berepresented by transmission to the terminal of whether the base stationoccupies the LBT subband (bit 1) or does not occupy the LBT subband (bit0) or transmission to the terminal of whether the base station transmitsa downlink signal through the LBT subband (bit 1) or does not transmitthe downlink signal through the LBT subband (bit 0). In this case,transmission of the result of the channel access procedure for each LBTsubband to the terminal may be represented by transmission to theterminal of whether the base station transmits a downlink signal throughthe LBT subband, but the downlink signal is punctured (bit 0) or thedownlink signal is rate-matched to the LBT subband (or not transmitted)(bit 1). That is, when the base station transmits the result of thechannel access procedure for each LBT subband to the terminal, it maymean that the base station may provide to the terminal, information thatallows the terminal to avoid receiving a control signal, a controlchannel, or a data channel in an LBT subband failing in channel access.Meanwhile, transmission of the result of the channel access procedurefor each LBT subband to the terminal through a bitmap is an example, andthe base station may represent a combination of results of the channelaccess procedure for respective LBT subbands as a bit string andtransmit a result among them to the terminal. When channel access usingconsecutive LBT subbands is allowed, for example, channel access usinginconsecutive LBT subbands such as LBT subbands #0 and #2 is notallowed, transmission of the combination of the results of the channelaccess procedure for respective LBT subbands to the terminal as a bitstring may minimize bits required for information transmission, whencompared to transmission of the result of the channel access procedureto the terminal through the bitmap.

The base station may transmit information about channel occupancy times11-90 and 11-95 of the base station, together with the result of thechannel access procedure, to the terminal through the downlink controlchannel. Herein, the channel occupancy time may be a time during whichthe base station may occupy an unlicensed band, occupation of which isinitiated after execution of the channel access procedure, withoutexecuting an additional channel access procedure. channel occupancy timeinformation may be expressed as a channel occupancy start time and/or achannel occupancy end time of the base station or a corresponding slotnumber and/or a symbol number, a slot index and/or a symbol indexcorresponding to the channel occupancy start time and/or the channeloccupancy end time, or the number of slots or symbols from a slot orsymbol in which a downlink control channel for transmitting the channeloccupancy time information is transmitted to a channel occupancy endslot or symbol. Meanwhile, the base station may transmit at least slotformat indicator information for a slot in the channel occupancy time,and the terminal may implicitly determine the channel occupancy timeinformation of the base station from the slot format indicatorinformation. The channel occupancy time information and the LBT resultinformation may be transmitted through the same downlink control channelor different downlink control channels.

Meanwhile, an uplink signal or channel transmitted in a channeloccupancy time of the base station starting channel occupancy afterexecution of a channel access procedure of Type 1 may be transmittedafter execution of a channel access procedure of Type 2 or Type 3.

In the following disclosure, a time period in which the base station orthe terminal is allowed to transmit and receive a radio signal throughthe above-described channel access procedure, etc. will be defined as a“channel occupancy duration”, which may be replaced with other similarterms such as a non-empty symbol (slot/duration), an occupied duration,etc., in actual application thereof. On the other hand, a time period inwhich the base station or the terminal is prohibited from transmittingand receiving a radio signal through the above-described channel accessprocedure, etc. will be defined as a “channel non-occupancy duration”,which may be replaced with other similar terms such as an empty symbol(slot/duration), a non-occupied duration, etc., in actual applicationthereof. The channel occupancy duration and the channel non-occupancyduration may be exclusive to each other in a frequency resource in atleast the same unit (e.g., a unit frequency resource for one channelaccess procedure for one LBT or subband LBT, which means that in the atleast unit frequency resource, a resource that is not the channeloccupancy duration may be understood as a channel non-occupancy durationand a resource that is not the channel non-occupancy duration may beunderstood as a channel occupancy duration.

In the disclosure, by providing methods for the base station or theterminal, such as determining a valid CSI report according to channeloccupancy or channel non-occupancy, determining a CSI referenceresource, determining a CPU occupation time, etc., the efficiency ofindication and channel state measurement for CSI reports of the basestation and the terminal may be improved.

Hereinafter, embodiments of the disclosure are described in detail withreference to the accompanying drawings. In a description of thedisclosure, when determined to make the subject matter of the disclosureunnecessarily unclear, the detailed description of the related functionsor structures may be skipped. The terms as used herein are definedconsidering the functions in the disclosure and may be changed accordingto the intention or practice of the user or operator. Therefore, theterms should be defined based on the overall disclosure.

While the foregoing examples have been described through multipleembodiments in the disclosure, they are not independent and one or moreembodiments of the disclosure may be applied at the same time or incombination.

First Embodiment: Method for Determining Valid Downlink Slot and CSIReference Resource According to Channel Occupancy or ChannelNon-Occupancy

In the first embodiment of the disclosure described below, a method fordetermining a valid downlink slot and a CSI reference resource accordingto channel occupancy or channel non-occupancy will be described.

As described above, when preemption for urgent communication in alicensed band is not considered, the base station may guaranteeuplink/downlink occupancy at all times based on autonomous determinationthereof. In this case, the base station and the terminal may assume adownlink slot n-n_(CSI-ref) as a CSI reference resource for a CSI reportexecuted in the uplink slot n′. In this case, the base station and theterminal may identify validity of the CSI reference resource based onthe following conditions to determine whether the downlink slot is avalid downlink slot. That is, in this example, a slot satisfying bothCondition 1 and Condition 2 may be determined as the valid downlinkslot. When the downlink slot is determined not to be the valid downlinkslot, the latest valid downlink slot among previous downlink slots maybe assumed as the CSI reference resource.

Condition 1) The valid downlink slot needs to include a downlink symbolor a flexible symbol configured via at least one higher layer. That is,when all symbols in a certain slot are configured as uplink symbols, theslot may not be a valid downlink slot.

Condition 2) The valid downlink slot should not overlap with ameasurement gap that is set for a certain terminal to performmeasurement for a handover, etc. That is, the terminal may not determinea slot including at least one of OFDM symbols included in themeasurement gap that is set for the terminal as the valid downlink slot.

Meanwhile, when channel occupancy is not guaranteed at all times due tothe channel access procedure in the unlicensed band, or preemption forurgent communication in the licensed band is considered, up/downlinkoccupancy may not be guaranteed at all times. Also in this case, thebase station and the terminal may assume a downlink slot n-n_(CSI-ref)as a CSI reference resource for a CSI report executed in the uplink slotn′. Meanwhile, in this case, when the base station and the terminaldetermines whether the downlink slot is the valid downlink slot bydetermining validity of a CSI reference resource, taking channeloccupancy uncertainty into account, additional conditions as well asCondition 1 and Condition 2 need to be considered.

One of the additional conditions for determining the valid downlink slotbased on the channel occupancy uncertainty may be a correlation betweenthe downlink symbol and the flexible symbol configured via a higherlayer in the downlink slot and the channel occupancy duration.

FIG. 12 illustrates an example of valid downlink slot determinationbased on a correlation between a downlink symbol and a flexible symbol,which are configured via a higher layer in a downlink slot, and achannel occupied duration, according to some embodiments of thedisclosure. Referring to FIG. 12, a relationship between downlink OFDMsymbols 12-05 and 12-55 and flexible OFDM symbols 12-10 and 12-60configured via a higher layer in one slot and channel occupancydurations 12-20 and 12-70 (or channel non-occupancy durations) may bedefined as Condition 3 or Condition 4, and according to one of themethods, CSI report validity check for the slot may be performed.

Condition 3) When all of the downlink OFDM symbols 12-05 configured viathe higher layer in one slot (or in addition, the flexible OFDM symbols12-10) are included in the channel occupancy duration 12-20, the slotmay be determined as the valid downlink slot, and when at least one ofthe downlink OFDM symbols 12-05 configured via the higher layer in oneslot (or in addition, the flexible OFDM symbols 12-10) is included inthe channel non-occupancy duration, the slot may not be determined asthe valid downlink slot. This is intended not to perform a CSI reportfor a corresponding slot because the entire downlink transmission or apart thereof planned by the base station in the slot has becomeimpossible in the above case.

Condition 4) When at least one of the downlink OFDM symbols 12-55configured via the higher layer in one slot (or in addition, theflexible OFDM symbols 12-60) is included in the channel occupancyduration 12-70, the slot may be determined as the valid downlink slot,and when all of the downlink OFDM symbols 12-55 configured via thehigher layer in one slot (or in addition, the flexible OFDM symbols12-70) are included in the channel non-occupancy duration, the slot maynot be determined as the valid downlink slot. This is intended not toperform a CSI report for a corresponding slot because downlinktransmission planned by the base station in the slot becomes impossiblein the above case.

Another one of the additional conditions for determining the validdownlink slot based on the channel occupancy uncertainty may be acorrelation between a transmission/reception point in time of a CSI-RSor CSI-IM resource referred to for a CSI report and the channeloccupancy duration.

FIG. 13 illustrates another example of valid downlink slot determinationaccording to some embodiments of the disclosure.

Referring to FIG. 13, for a CSI report 13-00 performed in the uplinkslot n′, a CSI reference resource 13-30 is assumed to be set at a timeearlier than 13-00 according to the foregoing rules. The terminal maymeasure the latest CSI-RS or CSI-RS and CSI-IM pairs 13-10, 13-15,13-20, and 13-25 transmitted prior to the CSI reference resource amongCSI-RSs or CSI-RS/CSI-IM pairs 13-10, 13-15, 13-20, 13-25, and 13-35indicated by at least one resource setting 13-05 referred to by the CSIreport 13-00, thus generating CSI for the CSI report 13-00. In thiscase, when the base station and the terminal determine validity of theCSI reference resource by considering channel occupancy uncertainty anddetermine whether the downlink slot is the valid downlink slot, arelationship between transmission timings of the CSI-RSs or theCSI-RS/CSI-IM pairs 13-10, 13-15, 13-20, and 13-25 and the channeloccupancy duration (or channel non-occupancy duration) may be defined byCondition 5 or Condition 6, and CSI report validity check for the slotmay be performed according to one of the foregoing methods.

Condition 5) The terminal may determine the slot as the valid downlinkslot when the latest CSI-RS or CSI-RS and CSI-IM pairs 13-10, 13-15,13-20, and 13-25 transmitted prior to the CSI reference resource aretransmitted among the CSI-RSs or CSI-RS/CSI-IM pairs 13-10, 13-15,13-20, 13-25, and 13-35 indicated by at least one resource setting 13-05referred to by the CSI report 13-00 in one slot. When the CSI-RSs orCSI-RS/CSI-IM pairs 13-10, 13-15, 13-20, and 13-25 are actuallytransmitted in the channel occupancy duration based on both Condition 3and Condition 4, the slot may be determined as the valid downlink slot.This is intended to guarantee that the terminal may complete channel andinterference measurement in a certain time period, takingcharacteristics of the unlicensed band temporarily occupying the channelinto account.

Condition 6) The terminal may determine the slot as the valid downlinkslot when at least one CSI-RS or at least one CSI-RS/CSI-IM pair aretransmitted among the latest CSI-RSs or CSI-RS/CSI-IM pairs 13-10,13-15, 13-20, and 13-25 transmitted before a CSI reference resourceindicated by all resource settings 13-05 referred to by the CSI report13-00 in one slot. When at least one CSI-RS or at least oneCSI-RS/CSI-IM pair is actually transmitted in the channel occupancyduration based on both Condition 3 and Condition 4, the slot may bedetermined as the valid downlink slot. This is intended to consider acase where CRI indicates one CSI-RS resource to perform RSRP report foreach CSI-RS resource and a case where CRI indicates a pair ofCSI-RS/CSI-IM resources to perform a CSI report based on a pair ofchannel measurement/interference measurement. This is also intended toperform a CSI report by considering characteristics of the unlicensedband temporarily occupying the channel, when minimum CSI reportingrequirements are established.

In the description of the disclosure, a flexible OFDM symbol configuredvia a higher layer may mean an OFDM symbol that may be to be indicatedas one of a downlink OFDM symbol, an uplink OFDM symbol, or a gap by aslot format indicator (SFI) in the DCI. Meanwhile, in the description ofthe disclosure, validity of a CSI reference resource and/or a CSI reporthas been determined using a downlink symbol or a flexible symbolconfigured via a higher layer, but for the unlicensed band, there maynot be fixed configuration for the downlink symbol, the flexible symbol,or the uplink symbol via the higher layer due to execution of thechannel access procedure. In other words, the terminal may not receiveconfiguration information for the downlink symbol, the flexible symbol,or the uplink symbol via a higher layer, but also in this case, themethod of determining the valid downlink slot according to thedisclosure may be applied. For example, the terminal may configure ordetermine all symbols as flexible symbols, and in this way, validity ofa CSI reference resource and/or a CSI report may be determined throughone of or a combination of a plurality of the above-describedconditions.

In the above example, Conditions 3 through 6 may be used in combinationof one or more thereof. That is, in the current example, the basestation and the terminal may assume the slot that satisfies bothCondition 1 and Condition 2 and additionally satisfies at least one ofCondition 3 through Condition 6 (or a certain sub set such as satisfyingCondition 3 and Condition 5 at the same time) as the valid downlinkslot.

When there is no valid downlink slot for a CSI reference resource forCSI report setting in one serving cell, the terminal may skip acorresponding CSI report (a CSI report to be performed for the servingcell in the uplink slot n′).

As described above, for CSI reporting transmitted in the uplink slot n′,the latest valid downlink slot among the downlink slot n-n_(CSI_ref) orslots previous thereto may be defined as a CSI reference resource. Inthis case, the terminal and the base station may skip a CSI report forthe CSI reference resource according to some rules as below. Inembodiments of the disclosure, skipping of the CSI report may bereplaced with various expressions such as omission, dropping, ornon-updating of the CSI report, but in order not to obscure the subjectmatter of the description, the redundant description will not beprovided.

Rule 1) After an event such as CSI report setting or re-setting, SCellactivation, BWP change/activation, semi-persistent CSI activation, etc.,the terminal may perform a CSI report when at least one CSI-RS or a pairof CSI-RS/CSI-IM transmission/reception occasions exist at a time notlater than the CSI reference resource, and otherwise, the terminal mayskip a CSI report. This is intended to reduce the burden of theterminal, when a meaningless CSI report is issued depending on varioussetting or environment changes, by avoiding operating for that case.

Rule 2) When discontinuous reception (DRX) is set such that the terminalperforms reception only in a DRX active time, the terminal may perform aCSI report when at least one CSI-RS or a pair of CSI-RS/CSI-IMtransmission/reception occasions exist in the DRX active time;otherwise, the terminal may skip a CSI report. This is intended toguarantee an idle time of the terminal, regardless of a CSI report in aDRX non-active time.

Rule 3) In CSI feedback calculation, for the terminal, it may beguaranteed that a non-zero power (NZP) CSI-RS resource for channelmeasurement and CSI-IM for interference measurement or NZP CSI-RS forinterference measurement do not overlap. This is intended uniformlymaintain channel and interference measurement complexity of the terminalfor a CSI report.

Rule 4) When some of OFDM symbols that transmit CSI-RS or CSI-IMassociated with a certain CSI report are included in a channelnon-occupancy duration, the terminal may skip the CSI report (or may notselect CRI indicating the CSI-RS or CSI-IM included in the channelnon-occupancy duration or may not update CRI-related CSI). This isintended to reduce the burden of the terminal, by preventing theassociated CSI report from being performed when a channel occupancyduration is not secured for transmission of CSI-RS or CSI-IM due to thechannel access procedure.

Rule 5) When all of the OFDM symbols that transmit the CSI-RS or CSI-IMassociated with the certain CSI report are included in the channelnon-occupancy duration and thus there are no available CSI-RS and CSI-IMprior to the CSI reference resource of the CSI report, the terminal mayskip the CSI report (or skip the CSI report when there are no CSI-RS andCSI-IM in the channel occupancy duration including the CSI referenceresource prior to the CSI reference resource of the CSI report). This isintended to reduce the burden of the terminal, by preventing the relatedCSI report from being performed when a channel occupancy duration is notsecured for transmission of CSI-RS or CSI-IM due to the channel accessprocedure and thus the CSI may not be obtained.

Rule 6) When the CSI reference resource of the certain CSI report is notincluded in the channel occupancy duration, the CSI report may beskipped. This is intended to reduce the burden of the terminal bypreventing the CSI report from being performed for a resource that isnot fixed as the channel occupancy duration due to the channel accessprocedure.

When Rules 1 through 6 are applied, the base station and the terminalmay determine whether to skip the CSI report based on a combination ofsome rules. For example, the terminal may apply Rules 1 through 3 at alltimes according to independent conditions such as CSI report setting orre-setting, SCell activation, BWP change/activation, semi-persistent CSIactivation, DRX setting, etc. The terminal may additionally apply atleast one of Rules 4 through 6 according to determination of the channeloccupancy duration or the channel non-occupancy duration. In particular,Rules 4 through 6 may be applied together with interrelation. Forexample, it may be agreed that when a CSI reference resource 13-30 of acertain CSI report 13-00 and CSI-RS/CSI-IM resources 13-10, 13-15,13-20, and 13-25 transmitted before the CSI reference resource 13-30 arenot included in X channel occupancy durations (or X ms/symbol/slot) dueto simultaneous application of Rules 5 and 6, the terminal skips the CSIreport. This may be understood as when the CSI reference resource 13-30of the certain CSI report 13-00 and the CSI-RS/CSI-IM resources 13-10,13-15, 13-20, and 13-25 transmitted before the CSI reference resource13-30 are included in the X channel occupancy durations (or Xms/symbol/slot) as in 13-70, the terminal performs a corresponding CSIreport. In this example, X may be a constant that is preset orconfigured via a higher layer, such as 1 or 2. This is intended toreduce the burden of the terminal by preventing the CSI report frombeing performed for a resource that is not fixed as the channeloccupancy duration due to the channel access procedure. The combinationof Rules 4 through 6 may be configured in various ways, but all possibleexamples will not be listed to avoid obscuring the subject matter of thedescription.

While the channel occupancy duration or the channel non-occupancyduration resulting from the channel access procedure of the unlicensedband in Rules 4 through 6 has been described as an applicationcondition, this may be extended to various cases such as channel non-usedue to a GC PDCCH or channel non-use due to preemption for urgentcommunication.

In the description of the disclosure, when the “terminal is guaranteedwith Condition A” may be interpreted as various meanings such as“Condition A is not expected not to be satisfied”, “Operation related toCondition A is not performed when Condition A is not satisfied”,“Indication of the base station related to Condition A is ignored whenCondition A is not satisfied”, etc. In addition, not to obscure thesubject matter of the description, the description will not be repeated.

Second Embodiment: Method of Calculating CPU Occupation According toChannel Occupancy or Channel Non-Occupancy

The second embodiment of the disclosure may provide a CPU occupationmethod according to channel occupancy or channel non-occupancy.

FIG. 14 illustrates an example of CPU occupation calculation accordingto some embodiments of the disclosure.

FIG. 14 illustrates a CPU occupation time for an aperiodic CSI report inwhich a report quantity included in CSI report #X is not set to ‘none’.When the base station indicates transmission of aperiodic CSI report #Xin the uplink slot n′ through DCI 14-05 using DCI format 0_1, one of thefollowing various CPU occupation time calculation methods may be appliedaccording to whether an uplink/downlink in which a PUSCH orCSI-RS/CSI-IM related to the CSI report #X is a licensed band or anunlicensed band or whether channel occupancy is possible at all times orconditional channel occupancy is possible (i.e., when a certainfrequency/time resource may be a channel occupancy duration and achannel non-occupancy duration).

Method 1) When channel occupancy for the uplink/downlink is possible atall times in the licensed band, CPU occupation time #1 14-20 for CSIreport #X 14-10 transmitted in the uplink slot n′ may be defined as“from a symbol next to the last symbol occupied by a PDCCH 14-05including DCI indicating aperiodic CSI report #X to the last symboloccupied by a PUSCH 14-15 including the CSI report #X transmitted in theuplink slot n′”.

Method 2) Method 2 is a method for calculating a CPU occupation time fora case where a part of an uplink resource for an aperiodic CSI report inwhich reportQuantity is not set to ‘none’ overlaps with the channelnon-occupancy duration. When the entire PUSCH resource 14-10 or a partthereof for CSI report #X transmitted in the uplink slot n′ overlapswith a channel non-occupancy duration 14-15 due to the channel accessprocedure, CPU occupation time #2 14-30 for the CSI report #X may bedefined as “from a symbol next to the last symbol occupied by the PDCCH14-05 including DCI indicating aperiodic CSI report #X to a start symbolof the channel non-occupancy duration (or the first symbol afterdetermination that the channel non-occupancy duration overlaps with thePUSCH resource 14-10)”. This is intended to guarantee a CPU room forperforming another CSI report, by cancelling the CPU occupation of thecorresponding CSI report when it is determined due to channelnon-occupancy that a certain CSI report may not be performed. In anotherexample, when the entire PUSCH resource 14-10 or a part thereof for CSIreport #X transmitted in the uplink slot n′ overlaps with a channelnon-occupancy duration 14-15 due to the channel access procedure, CPUoccupation time #3 14-40 for the CSI report #X may be defined as “from asymbol next to the last symbol occupied by the PDCCH 14-05 including DCIindicating aperiodic CSI report #X to the first symbol of the PUSCHresource 14-10”. This is intended to guarantee a CPU room for performinganother CSI report, by cancelling the CPU occupation before PUSCHtransmission of the corresponding CSI report, when it is determined dueto channel non-occupancy that a certain CSI report may not be performed.In another example, when the entire PUSCH resource 14-10 or a partthereof for CSI report #X transmitted in the uplink slot n′ overlapswith a channel non-occupancy duration 14-15 due to the channel accessprocedure, CPU occupation time #4 14-50 for the CSI report #X may bedefined as cancelling the entire existing CPU occupation 14-20. This isintended to guarantee a CPU room for performing another CSI report, byreleasing the entire CPU occupation period of the corresponding CSIreport, when it is determined due to channel non-occupancy that certainCSI reporting may not be performed.

Method 3) Method 3 is a method for calculating a CPU occupation time fora case where a part of an uplink resource for a periodic orsemi-persistent CSI report in which reportQuantity is not set to ‘none’overlaps with the channel non-occupancy duration. Method 3 is similar ina detailed method thereof with Method 2, but as the start point of theCPU occupation, “the last symbol occupied by the PDCCH including the DCIindicating aperiodic CSI report #X” may be replaced with “the firstsymbol of the first transmitted CSI-RS/CSI-IM/SSB resource correspondingto the last CSI-RS/CSI-IM/SSB occasion 15-10 among CSI-RS/CSI-IM/SSBoccasions for CSI report #X”. To avoid obscuring the subject matter ofthe description, a detailed example of all methods will be omitted.

FIG. 15 illustrates another example of CPU occupation calculationaccording to some embodiments of the disclosure.

Referring to FIG. 15, a CPU occupation time for a periodic orsemi-persistent CSI report in which a report quantity included in theCSI report is not set to ‘none’ may be determined. When the base stationindicates transmission of periodic or semi-persistent CSI report #X15-00 in the uplink slot n′ through higher layer signaling or DCI usingDCI format 0_1 scrambled by SP-CSI-RNTI, one of the following variousCPU occupation time calculation methods may be applied according towhether an uplink/downlink in which a PUSCH or CSI-RS/CSI-IM related tothe CSI report #X is a licensed band or an unlicensed band or whetherchannel occupancy is possible at all times or conditional channeloccupancy is possible (i.e., when a certain frequency/time resource maybe a channel occupancy duration and a channel non-occupancy duration).

Method 4) When channel occupancy for the uplink/downlink is possible atall times in the licensed band, a CPU occupation time 15-30 for CSIreport #X transmitted in the uplink slot n′ may be defined as “from thefirst symbol of the first transmitted CSI-RS/CSI-IM/SSB resource 15-10corresponding to the last CSI-RS/CSI-IM/SSB occasion amongCSI-RS/CS-IM/SSB occasions for the CSI report #X transmitted in theuplink slot n′ to the last symbol occupied by a PUCCH or PUSCH 15-00including the CSI report #X transmitted in the uplink slot n”′.

In the following description of the disclosure, for convenience of adescription, “the first transmitted CSI-RS/CSI-IM/SSB resourcecorresponding to the last CSI-RS/CSI-IM/SSB occasion amongCSI-RS/CS-IM/SSB occasions for the CSI report #X” will be described as“the latest CSI-RS/CSI-IM/SSB resource for CSI report #X”.Exceptionally, when the base station indicates a semi-persistent CSIreport through DCI such that the terminal performs the first CSI reportof semi-persistent CSI report #X, a CPU occupation time for the firstCSI report may be defined “from a symbol next to the last symboloccupied by a PDCCH including DCI indicating the semi-persistent CSIreport #X to the last symbol occupied by a PUSCH including the first CSIreport”. In this way, time-domain operation causality of the terminalmay be guaranteed based on a point in time at which a CSI report startsand a point in time at which a CPU occupation time starts.

Method 5) Method 5 is a method for calculating a CPU occupation time fora case where some of CSI-RS/CSI-IM resources for a periodic orsemi-persistent CSI report in which reportQuantity is not set to ‘none’overlap with the channel non-occupancy duration. When some or all of“the latest CSI-RS/CSI-IM/SSB resources 15-10 for CSI report #X” overlapwith the channel non-occupancy duration 15-20 due to the channel accessprocedure, CPU occupation time #2 15-40 for CSI report #X may be definedas “from the first symbol of “the latest CSI-RS/CSI-IM/SSB resource15-20 before the channel non-occupancy duration for CSI report #X” tothe last symbol occupied by the PUCCH or PUSCH 15-00 including CSIreport #X transmitted in the uplink slot n′”. This is intended to securea room for CPU occupancy of the terminal, considering that when RStransmission/reception for a CSI report are not performed due to channelnon-occupancy, a CSI report needs to be performed with reference to anRS transmitted before the RS. In another example, when all or some of“the latest CSI-RS/CSI-IM/SSB resources 15-10 for CSI report #X” overlapwith the channel non-occupancy duration 15-20 due to the channel accessprocedure, CPU occupation time #3 15-50 for the CSI report #X may bedefined as cancelling the entire existing CPU occupation 15-30. In thisway, considering that when RS transmission/reception for a CSI reportare not performed due to channel non-occupancy, the CSI report needs tobe performed with reference to an RS transmitted before the RS, it maybe taken into consideration that CSI generation based on the previouslytransmitted RS has been completed.

When the CSI report is performed, i.e., multiple NZP CSI-RS resources orCSI-IM resources are configured in one resource setting, one NZP CSI-RSresource may be used for CSI calculation by being paired with one CSI-IMresource. That is, when a total of N CSI-RS resources are configured ina certain resource setting and a total of N CSI-IM resources areconfigured in another resource setting such that CRI may indicate one of0 through (N−1), CRI=0 may mean that the first CSI-IM resource amongCSI-RS and CSI-IM resources configured in the resource setting forcorresponding CSI calculation and channel and interference measurementfrom the first CSI-RS resource are used, and CRI=N−1 may mean that an(N−1)^(th) CSI-IM resource among CSI-RS and CSI-IM resources configuredin the resource setting for corresponding CSI calculation and channeland interference measurement from the (N−1)^(th) CSI-RS resource areused. When one CSI-RS resource or CSI-IM resource among the n^(th){CSI-RS resource, CSI-IM resource} pair overlaps with the channelnon-occupancy duration, the terminal may assume that the other resourcesthat do not overlap with the channel non-occupation duration overlapwith the channel non-occupancy duration. This may mean that when atleast one resource among a CSI-RS resource or a CSI-IM resourceindicated by a certain CRI value overlaps with the channel non-occupancyduration, the terminal is not to report the CRI value to the basestation.

Meanwhile, a time in which overlapping of the channel non-occupancyduration with the PUSCH resource is fixed may be the first symbol aftera minimum processing time required for the terminal to obtain channeloccupancy time information by processing DCI immediately after the lastsymbol occupied by the PDCCH including the DCI including at leastchannel occupancy duration information from the base station. In thedescription of the disclosure, when the “terminal is guaranteed withCondition A” may be interpreted as various meanings such as “Condition Ais not expected not to be satisfied”, “Operation related to Condition Ais not performed when Condition A is not satisfied”, “Indication of thebase station related to Condition A is ignored when Condition A is notsatisfied”, etc. In addition, not to obscure the subject matter of thedescription, the foregoing description will not be repeated.

Third Embodiment: Method of Determining CSI-RS Active Duration Accordingto Channel Occupancy or Channel Non-Occupancy

The third embodiment of the disclosure may provide a method ofdetermining a CSI-RS active duration according to channel occupancy orchannel non-occupancy.

The following active duration may be defined for an NZP CSI-RS resource(or a CSI-IM resource or SSB). The terminal may be guaranteed not tomeasure active CSI-RS ports or active CSI-RS resources of a numbergreater than a value reported through terminal (UE) capability signalingin a certain slot. When one CSI-RS resource is referred to by N CSIreporting settings (that is, one CSI-RS resource involves generation ofN CSI), the CSI-RS resource may be counted as N active CSI-RS resources.An active duration of a CSI-RS resource or port may be defineddifferently according to a time domain behavior of CSI-RS. For aperiodicCSI-RS, an active duration may be defined as from “a symbol in which atriggering PDCCH ends to a time at which PUSCH transmission including arelated CSI report ends”. For semi-persistent (Sp) CSI-RS, an activeduration may be defined as “from a time at which an activation commandof the Sp CSI-RS is applied (for MAC CE-based activation, a time after 3ms from a time at which HARQ-ACK for the MAC CE is reported and forDCI-based activation, a time at which the last symbol of a PDCCHincluding the DCI ends) to a time (the same as the above) at which adeactivation command of the Sp CSI-RS is applied”. For periodic (P)CSI-RS, an active duration may be defined as “from a time at which the PCSI-RS is configured through a higher layer to a time at which higherlayer configuration of the P CSI-RS is released”. The active duration ofthe SSB may refer to the definition of an active duration for P CSI-RS.

Meanwhile, based on transmission or non-transmission of an RS due to thechannel occupancy duration or the channel non-occupancy duration, anactive duration for the CSI-RS (or CSI-IM or SSB) resource and port maybe modified by referring to one of the following methods:

Method 1) According to the first method, when certain Sp or P CSI-RSresources overlap with the channel non-occupancy duration, the Sp or PCSI-RS port or resources may not be considered as active CSI-RS port orresources from a time at which the channel non-occupancy duration starts(or ends) to the earliest transmission time among the Sp or P CSI-RSresources transmitted after the channel non-occupancy duration. It maybe understood that when a certain Sp or P CSI-RS resource fails to betransmitted due to channel non-occupancy, an active duration for CSI-RSresources or ports transmitted in the resource is cancelled until nexttransmission. In this case, advantageously, in case of occurrence of thechannel non-occupancy duration at the Sp or P CSI-RS transmission time,additional Ap CSI-RS transmission may be performed without waiting for anext transmission time of the Sp or P CSI-RS. The time at whichcancellation for the activation duration of the Sp or P CSI-RS ends mayextend to a PUSCH transmission end time for a CSI report based onadditional Ap CSI-RS transmission, when the additional Ap CSI-RStransmission occurs before the next transmission time of Sp or P CSI-RS.That is, “the time at which cancellation for the activation duration ofthe Sp or P CSI-RS ends” may be a time coming later between “the nexttransmission time of Sp or P CSI-RS” and “the PUSCH transmission endtime for CSI report based on the additional Ap CSI-RS transmission”. Inthis way, the terminal and the base station may not infringe a terminalcapability report value for maximum CSI-RS ports or active CSI-RSresources due to the additional Ap CSI-RS transmission.

Method 2) The second method does not consider Ap CSI-RS ports orresources in an overlapping duration as active CSI-RS ports or resourceswhen certain AP CSI-RS overlaps with the channel non-occupancy duration.In this case, “a time at which Ap CSI-RS ports or resources overlappingwith the channel non-occupancy duration are not considered as activeCSI-RS ports or resources” may be agreed as a start symbol of thechannel non-occupancy duration, or in another example, as a later timebetween a time at which a start point of the channel non-occupancyduration is known and the last symbol of the PDCCH including triggeringDCI of the Ap CSI-RS. By using the second method, the base station andthe terminal may secure a room for performing another CSI report byavoiding maintaining an Ap CSI-RS active duration for an invalid CSIreport.

According to Methods 1 and 2, the terminal may ignore, skip, or do notupdate a CSI report referring to CSI-RS that is not the active CSI-RS.In this way, the flexibility of CSI report setting or trigger may beimproved and the efficiency of data transmission may be enhanced.

FIG. 16 illustrates a flowchart of an operation order of a base stationand a terminal, according to some embodiments of the disclosure.

Referring to FIG. 16, the base station may notify the terminal of CSIreport-related configurations or indicate or trigger anaperiodic/semi-persistent CSI report based on the configurations, inoperation 16-00. Thereafter, the base station and the terminal maydetermine whether a downlink channel for receiving an RS signal isoccupied, by using at least one of the methods according to the firstthrough third embodiments of the disclosure, in operation 16-05. Thebase station and the terminal may then determine whether an uplinkchannel for a CSI report is occupied, by using at least one of themethods according to the first through third embodiments of thedisclosure, in operation 16-15. The base station and the terminal maydetermine validity of the CSI report by using at least one of themethods according to the first through third embodiments of thedisclosure and execute a CSI report accordingly, in operation 16-20.

FIG. 17 illustrates a block diagram illustrating a configuration of aterminal according to some embodiments of the disclosure.

Referring to FIG. 17, a terminal may include a terminal receiver 17-00,a terminal transmitter 17-10, and a terminal processor 17-05. Theterminal receiver 17-00 and the terminal transmitter 17-10 may becollectively referred to as a transceiver. According to theabove-described communication method of the terminal, the terminalreceiver 17-00, the terminal transmitter 17-10, and the terminalprocessor 17-05 of the terminal may operate. However, components of theterminal are not limited to the above-described example. For example,the terminal may include more components (e.g., a memory, etc.) or fewercomponents than the above-described components. Moreover, the terminalreceiver 17-00, the terminal transmitter 17-10, and the terminalprocessor 17-05 may be implemented in a single chip form.

The terminal receiver 17-00 and the terminal transmitter 17-10 (ortransceiver) may transmit and receive a signal to and from the basestation. The signal may include control information and data. To thisend, the transceiver may include an RF transmitter that up-converts andamplifies a frequency of a transmission signal and an RF receiver thatlow-noise-amplifies a received signal and down-converts a frequency.However, this is merely an example of the transceiver, components ofwhich are not limited to the RF transmitter and the RF receiver.

The transceiver may receive a signal through a radio channel and outputthe received signal to the terminal processor 17-05, and transmit asignal output from the terminal processor 17-05 through the radiochannel.

The memory (not shown) may store programs and data required for anoperation of the terminal. The memory may also store control informationor data included in a signal obtained by the terminal. The memory mayinclude a storage medium such as ROM, RAM, hard-disk, CD-ROM, DVD, etc.,or a combination of storage media.

The terminal processor may control a series of processes such that theterminal operates according to the above-described embodiment of thedisclosure. The terminal processor 17-05 may be implemented as acontroller or one or more processors.

FIG. 18 illustrates a block diagram illustrating a configuration of abase station according to some embodiments of the disclosure.

Referring to FIG. 18, the base station may include a base stationreceiver 18-00, a base station transmitter 18-10, and a base stationprocessor 18-05. The base station receiver 18-00 and the base stationtransmitter 18-10 will be collectively referred to as a transceiver.According to the above-described communication method of the basestation, the base station receiver 18-00, the base station transmitter18-10, and the base station processor 18-05 of the base station mayoperate. However, components of the base station are not limited to theabove-described example. For example, the base station may include morecomponents (e.g., a memory, etc.) or fewer components than theabove-described components. Moreover, the base station receiver 18-00,the base station transmitter 18-10, and the base station processor 18-05may be implemented in the form of a single chip.

The base station receiver 18-00 and the base station transmitter 18-10(or transceiver) may transmit and receive a signal to and from theterminal. Herein, the signal may include control information and data.To this end, the transceiver may include an RF transmitter thatup-converts and amplifies a frequency of a transmission signal and an RFreceiver that low-noise-amplifies a received signal and down-converts afrequency. However, this is merely an example of the transceiver,components of which are not limited to the RF transmitter and the RFreceiver.

The transceiver may receive a signal through a radio channel and outputthe received signal to the base station processor 18-05, and transmit asignal output from the base station processor 18-05 through the radiochannel.

The memory (not shown) may store programs and data required for anoperation of the base station. The memory may also store controlinformation or data included in a signal obtained by the base station.The memory may include a storage medium such as ROM, RAM, hard-disk,CD-ROM, DVD, etc., or a combination of storage media.

The base station processor 18-05 may control a series of processes suchthat the base station operates according to the above-describedembodiment of the disclosure. The base station processor 18-05 may beimplemented as a controller or one or more processors.

Disclosed embodiments of the disclosure may provide an apparatus andmethod for effectively saving a power of the terminal in a wirelesscommunication system.

Although the present disclosure has been described with variousembodiments, various changes and modifications may be suggested to oneskilled in the art. It is intended that the present disclosure encompasssuch changes and modifications as fall within the scope of the appendedclaims.

What is claimed is:
 1. A method performed by a terminal in a wirelesscommunication system, the method comprising: receiving, from a basestation, configuration information associated with a channel stateinformation (CSI) report including at least one information associatedwith a CSI resource setting; receiving, from the base station,information associated with channel occupancy duration; determiningwhether at least one symbol for receiving a channel state informationreference signal (CSI-RS) is within channel occupancy duration, based onthe at least one information associated with the CSI resource settingand the received information associated with the channel occupancyduration; receiving, from the base station, at least one CSI-RS on theat least one symbol, based on a result of the determining; and when aCSI report is determined to be transmitted, transmitting, to the basestation, the CSI report based on the configuration informationassociated with the CSI report and the received at least one CSI-RS. 2.The method of claim 1, wherein, when the at least one symbol forreceiving the CSI-RS is determined to not be within the channeloccupancy duration, the at least one CSI-RS is not received by theterminal on the at least one symbol; and wherein, when the at least onesymbol for receiving the CSI-RS is determined to be within the channeloccupancy duration, the at least one CSI-RS is received by the terminalbased on the at least one symbol.
 3. The method of claim 1, furthercomprising: determining whether an uplink channel for transmitting theCSI report is within the channel occupancy duration based on theconfiguration information associated with the CSI report and theinformation associated with channel occupancy duration; and when theuplink channel for transmitting the CSI report is within the channeloccupancy duration, determining the CSI report to be transmitted.
 4. Themethod of claim 1, wherein the receiving of the at least one CSI-RS onthe at least one symbol based on the result of the determiningcomprises: determining that all of symbols for CSI-RS reception arewithin the channel occupancy duration; and receiving the CSI-RS in whichall of the symbols for CSI-RS reception are within the channel occupancyduration.
 5. The method of claim 1, wherein the receiving of the atleast one CSI-RS on the at least one symbol based on the result of thedetermining comprises: determining that at least one symbol for CSI-RSreception is within the channel occupancy duration; and receiving theCSI-RS in which the at least one symbol for CSI-RS reception is withinthe channel occupancy duration.
 6. The method of claim 1, furthercomprising: determining a CSI processing unit (CPU) occupation timeregardless of the channel occupancy duration, wherein the CSI report istransmitted based on the determined CPU occupation time.
 7. The methodof claim 1, further comprising: identifying channel non-occupancyduration for the CSI report based on the information associated withchannel occupancy duration; determining a most recent CSI-RS before thechannel non-occupancy duration for the CSI report; and determining a CPUoccupation time based on the most recent CSI-RS before channelnon-occupancy duration for the CSI report, wherein the CSI report istransmitted based on the determined CPU occupation time.
 8. The methodof claim 1, further comprising: identifying channel non-occupancyduration for the CSI report based on the information associated withchannel occupancy duration; and determining a most recent CSI-RS beforethe channel non-occupancy duration for the CSI report, wherein the CSIreport is transmitted based on the most recent CSI-RS.
 9. A methodperformed by a base station in a wireless communication system, themethod comprising: transmitting, to a terminal, configurationinformation associated with a channel state information (CSI) reportincluding at least one information associated with a CSI resourcesetting; transmitting, to the terminal, information associated withchannel occupancy duration; transmitting, to the terminal, at least onechannel state information reference signal (CSI-RS); and receiving, fromthe terminal, a CSI report based on the configuration informationassociated with the CSI report, wherein the CSI report is transmitted bythe terminal based on some of the at least one CSI-RS and the at leastone information associated with the CSI resource setting; and whereinsome of the at least one CSI-RS comprise at least one CSI-RS within thechannel occupancy duration.
 10. The method of claim 9, wherein, when atleast one symbol for transmitting the at least one CSI-RS is determinednot to be within the channel occupancy duration, the at least one CSI-RSis not received by the terminal based on the at least one symbol; andwherein, when the at least one symbol for transmitting the at least oneCSI-RS is determined to be within the channel occupancy duration, the atleast one CSI-RS is received by the terminal based on the at least onesymbol.
 11. A terminal in a wireless communication system, the terminalcomprising: a transceiver; and at least one processor coupled with thetransceiver and configured to: receive, from a base station,configuration information associated with a channel state information(CSI) report including at least one information associated with a CSIresource setting, receive, from the base station, information associatedwith channel occupancy duration, determine whether at least one symbolfor receiving a channel state information reference signal (CSI-RS) iswithin channel occupancy duration, based on the at least one informationassociated with the CSI resource setting and the received informationassociated with the channel occupancy duration, receive, from the basestation, at least one CSI-RS on the at least one symbol, based on aresult of the determining, and when a CSI report is determined to betransmitted, transmit, to the base station, the CSI report based on theconfiguration information associated with the CSI report and thereceived at least one CSI-RS.
 12. The terminal of claim 11, wherein,when the at least one symbol for receiving the CSI-RS is determined tonot be within the channel occupancy duration, the at least one CSI-RS isnot received by the terminal based on the at least one symbol; andwherein, when the at least one symbol for receiving the CSI-RS isdetermined to be within the channel occupancy duration, the at least oneCSI-RS is received by the terminal based on the at least one symbol. 13.The terminal of claim 11, wherein the at least one processor is furtherconfigured to: determine whether an uplink channel for transmitting theCSI report is within the channel occupancy duration based on theconfiguration information associated with the CSI report and theinformation associated with channel occupancy duration, and when theuplink channel for transmitting the CSI report is within the channeloccupancy duration, determine the CSI report to be transmitted.
 14. Theterminal of claim 11, wherein the at least one processor is furtherconfigured to: determine that all of symbols for CSI-RS reception iswithin the channel occupancy duration, and receive the CSI-RS in whichall of symbols for CSI-RS reception are within the channel occupancyduration.
 15. The terminal of claim 11, wherein the at least oneprocessor is further configured to: determine that at least one symbolfor CSI-RS reception is within the channel occupancy duration, andreceive the CSI-RS in which the at least one symbol for CSI-RS receptionis within the channel occupancy duration.
 16. The terminal of claim 11,wherein the at least one processor is further configured to: determine aCSI processing unit (CPU) occupation time regardless of the channeloccupancy duration, wherein the CSI report is transmitted based on thedetermined CPU occupation time.
 17. The terminal of claim 11, whereinthe at least one processor is further configured to: identify channelnon-occupancy duration for the CSI report based on the informationassociated with channel occupancy duration, determine a most recentCSI-RS before the channel non-occupancy duration for the CSI report, anddetermine a CPU occupation time based on the most recent CSI-RS beforechannel non-occupancy duration for the CSI report, wherein the CSIreport is transmitted based on the determined CPU occupation time. 18.The terminal of claim 11, wherein the at least one processor is furtherconfigured to: identify channel non-occupancy duration for the CSIreport based on the information associated with channel occupancyduration; and determine a most recent CSI-RS before the channelnon-occupancy duration for the CSI report, wherein the CSI report istransmitted based on the most recent CSI-RS.
 19. A base station in awireless communication system, the base station comprising: atransceiver; and at least one processor coupled with the transceiver andconfigured to: transmit, to a terminal, configuration informationassociated with a channel state information (CSI) report including atleast one information associated with a CSI resource setting, transmit,to the terminal, information associated with channel occupancy duration,transmit, to the terminal, at least one channel state informationreference signal (CSI-RS), and receive, from the terminal, a CSI reportbased on the configuration information associated with the CSI report,wherein the CSI report is transmitted by the terminal based on some ofthe at least one CSI-RS and the at least one information associated withthe CSI resource setting; and wherein some of the at least one CSI-RScomprise at least one CSI-RS within the channel occupancy duration. 20.The base station of claim 19, wherein, when at least one symbol fortransmitting the at least one CSI-RS is determined to not be within thechannel occupancy duration, the at least one CSI-RS is not received bythe terminal based on the at least one symbol; and wherein, when the atleast one symbol for transmitting the at least one CSI-RS is determinedto be within the channel occupancy duration, the at least one CSI-RS isreceived by the terminal based on the at least one symbol.